Changeset 1440 for trunk/help
- Timestamp:
- Jul 24, 2014 10:00:59 AM (11 years ago)
- Location:
- trunk/help
- Files:
-
- 3 added
- 2 edited
Legend:
- Unmodified
- Added
- Removed
-
TabularUnified trunk/help/Fit Peaks.htm ¶
r1434 r1440 23 23 <o:Author>Von Dreele</o:Author> 24 24 <o:LastAuthor>Von Dreele</o:LastAuthor> 25 <o:Revision> 2</o:Revision>26 <o:TotalTime>8 45</o:TotalTime>25 <o:Revision>3</o:Revision> 26 <o:TotalTime>857</o:TotalTime> 27 27 <o:Created>2014-07-21T14:48:00Z</o:Created> 28 <o:LastSaved>2014-07-2 1T14:48:00Z</o:LastSaved>28 <o:LastSaved>2014-07-24T14:58:00Z</o:LastSaved> 29 29 <o:Pages>12</o:Pages> 30 <o:Words>27 63</o:Words>31 <o:Characters>15 750</o:Characters>30 <o:Words>2797</o:Words> 31 <o:Characters>15949</o:Characters> 32 32 <o:Company>Argonne National Laboratory</o:Company> 33 <o:Lines>13 1</o:Lines>34 <o:Paragraphs>3 6</o:Paragraphs>35 <o:CharactersWithSpaces>18 477</o:CharactersWithSpaces>33 <o:Lines>132</o:Lines> 34 <o:Paragraphs>37</o:Paragraphs> 35 <o:CharactersWithSpaces>18709</o:CharactersWithSpaces> 36 36 <o:Version>14.00</o:Version> 37 37 </o:DocumentProperties> … … 45 45 <w:WordDocument> 46 46 <w:Zoom>FullPage</w:Zoom> 47 <w:SpellingState>Clean</w:SpellingState> 48 <w:GrammarState>Clean</w:GrammarState> 47 49 <w:TrackMoves>false</w:TrackMoves> 48 50 <w:TrackFormatting/> … … 900 902 mso-hansi-font-family:Tahoma; 901 903 mso-bidi-font-family:Tahoma;} 904 span.SpellE 905 {mso-style-name:""; 906 mso-spl-e:yes;} 907 span.GramE 908 {mso-style-name:""; 909 mso-gram-e:yes;} 902 910 .MsoChpDefault 903 911 {mso-style-type:export-only; … … 1106 1114 </style> 1107 1115 <![endif]--><!--[if gte mso 9]><xml> 1108 <o:shapedefaults v:ext="edit" spidmax="102 7"/>1116 <o:shapedefaults v:ext="edit" spidmax="1026"/> 1109 1117 </xml><![endif]--><!--[if gte mso 9]><xml> 1110 1118 <o:shapelayout v:ext="edit"> … … 1117 1125 <div class=WordSection1> 1118 1126 1119 <h1>Fit Peaks/ Autoindexingin GSAS-II </h1>1127 <h1>Fit Peaks/<span class=SpellE>Autoindexing</span> in GSAS-II </h1> 1120 1128 1121 1129 <p class=MsoNormal>In this exercise you will use GSAS-II to search for a unit … … 1135 1143 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family: 1136 1144 Calibri;mso-bidi-theme-font:minor-latin'>Import/Powder Data/from GSAS powder 1137 data file</span></b> menu item to read the data file into the current GSAS-II 1138 project. This read option is set to read any of the powder data formats defined 1139 for GSAS (angles in centidegrees, TOF in µsec). Other submenu items will read 1140 the <b style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; 1141 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family: 1142 Calibri;mso-bidi-theme-font:minor-latin'>cif</span></b> format or the <b 1143 style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; 1144 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family: 1145 Calibri;mso-bidi-theme-font:minor-latin'>xye</span></b> format (angles in 1146 degrees) used by Topas, etc.<span style='mso-spacerun:yes'> </span>Change the 1147 file directory to <b style='mso-bidi-font-weight:normal'><span 1148 style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:minor-latin; 1149 mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri;mso-bidi-theme-font: 1150 minor-latin'>Exercises/LaB6</span></b><span style='font-family:"Calibri","sans-serif"; 1151 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family: 1152 Calibri;mso-bidi-theme-font:minor-latin'> to find the file; you may need to 1153 change the file type to <b style='mso-bidi-font-weight:normal'>All files (*.*)</b> 1154 to find the desired file.</span></p> 1145 data file</span></b> menu item to read the data file into the current GSAS-II project. 1146 This read option is set to read any of the powder data formats defined for GSAS 1147 (angles in <span class=SpellE>centidegrees</span>, TOF in µsec). Other submenu 1148 items will read the <span class=SpellE><b style='mso-bidi-font-weight:normal'><span 1149 style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:minor-latin; 1150 mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri;mso-bidi-theme-font: 1151 minor-latin'>cif</span></b></span> format or the <span class=SpellE><b 1152 style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; 1153 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family: 1154 Calibri;mso-bidi-theme-font:minor-latin'>xye</span></b></span> format (angles 1155 in degrees) used by <span class=SpellE>Topas</span>, etc.<span 1156 style='mso-spacerun:yes'> </span>Change the file directory to <b 1157 style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; 1158 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family: 1159 Calibri;mso-bidi-theme-font:minor-latin'>Exercises/LaB6</span></b><span 1160 style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:minor-latin; 1161 mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri;mso-bidi-theme-font: 1162 minor-latin'> to find the file; you may need to change the file type to <b 1163 style='mso-bidi-font-weight:normal'>All files (*.*)</b> to find the desired 1164 file.</span></p> 1155 1165 1156 1166 <p class=MsoListParagraphCxSpMiddle style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span … … 1166 1176 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family: 1167 1177 Calibri;mso-bidi-theme-font:minor-latin'>Open</span></b>. There will be a 1168 Dialog box asking <b style='mso-bidi-font-weight:normal'><span 1169 style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:minor-latin; 1170 mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri;mso-bidi-theme-font: 1171 minor-latin'>Is this the file you want?</span></b> Press <b style='mso-bidi-font-weight: 1172 normal'><span style='font-family:"Calibri","sans-serif";mso-ascii-theme-font: 1173 minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri; 1174 mso-bidi-theme-font:minor-latin'>Yes</span></b> button to proceed.</p> 1178 Dialog box asking <span class=GramE><b style='mso-bidi-font-weight:normal'><span 1179 style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:minor-latin; 1180 mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri;mso-bidi-theme-font: 1181 minor-latin'>Is</span></b></span><b style='mso-bidi-font-weight:normal'><span 1182 style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:minor-latin; 1183 mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri;mso-bidi-theme-font: 1184 minor-latin'> this the file you want?</span></b> Press <span class=GramE><b 1185 style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; 1186 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family: 1187 Calibri;mso-bidi-theme-font:minor-latin'>Yes</span></b></span> button to 1188 proceed.</p> 1175 1189 1176 1190 <p class=MsoListParagraphCxSpLast style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span … … 1181 1195 Calibri;mso-bidi-theme-font:minor-latin'>11bmb_3844.prm</span></b> instrument 1182 1196 parameter file is automatically selected; it was produced by 11BM-B instrument 1183 processing software when the corresponding <b style='mso-bidi-font-weight:normal'><span 1184 style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:minor-latin; 1185 mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri;mso-bidi-theme-font: 1186 minor-latin'>fxye</span></b> file was created from the 12 detector raw data. If 1187 absent or the name doesnt match the data file name, a file dialog will appear 1188 for you to select the correct instrument parameter file.</p> 1197 processing software when the corresponding <span class=SpellE><b 1198 style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; 1199 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family: 1200 Calibri;mso-bidi-theme-font:minor-latin'>fxye</span></b></span> file was 1201 created from the 12 detector raw data. If absent or the name doesnt match the 1202 data file name, a file dialog will appear for you to select the correct 1203 instrument parameter file.</p> 1189 1204 1190 1205 <p class=MsoNormal>At this point the <b style='mso-bidi-font-weight:normal'><span … … 1219 1234 src="Fit%20Peaks_files/image001.png" v:shapes="Picture_x0020_1"><![endif]></span></p> 1220 1235 1221 <p class=MsoNormal>and the plot window will show the powder pattern</p> 1236 <p class=MsoNormal><span class=GramE>and</span> the plot window will show the 1237 powder pattern</p> 1222 1238 1223 1239 <p class=MsoNormal><span style='mso-no-proof:yes'><!--[if gte vml 1]><v:shape … … 1241 1257 style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:minor-latin; 1242 1258 mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri;mso-bidi-theme-font: 1243 minor-latin'>changed</span></b> row of entry boxes to set < b style='mso-bidi-font-weight:1244 normal'><span style='font-family:"Calibri","sans-serif";mso-ascii-theme-font: 1245 m inor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri;1246 mso-bidi-theme-font:minor-latin'>Tmin</span></b> and <b style='mso-bidi-font-weight: 1247 normal'><span style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:1248 minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri; 1249 m so-bidi-theme-font:minor-latin'>Tmax</span></b> to <b style='mso-bidi-font-weight:1250 normal'><span style='font-family:"Calibri","sans-serif";mso-ascii-theme-font: 1251 m inor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri;1252 mso-bidi-theme-font:minor-latin'>4</span></b> and <b style='mso-bidi-font-weight:1259 minor-latin'>changed</span></b> row of entry boxes to set <span class=SpellE><b 1260 style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; 1261 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family: 1262 Calibri;mso-bidi-theme-font:minor-latin'>Tmin</span></b></span> and <span 1263 class=SpellE><b style='mso-bidi-font-weight:normal'><span style='font-family: 1264 "Calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-hansi-theme-font: 1265 minor-latin;mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin'>Tmax</span></b></span> 1266 to <b style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; 1267 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family: 1268 Calibri;mso-bidi-theme-font:minor-latin'>4</span></b> and <b style='mso-bidi-font-weight: 1253 1269 normal'><span style='font-family:"Calibri","sans-serif";mso-ascii-theme-font: 1254 1270 minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri; … … 1261 1277 1262 1278 <p class=MsoNormal><span style='mso-no-proof:yes'><!--[if gte vml 1]><v:shape 1263 id=" Picture_x0020_29" o:spid="_x0000_i1050" type="#_x0000_t75" style='width:226.5pt;1264 height:123.75pt;visibility:visible;mso-wrap-style:square'>1279 id="_x0000_i1050" type="#_x0000_t75" style='width:226.5pt;height:123.75pt; 1280 visibility:visible;mso-wrap-style:square'> 1265 1281 <v:imagedata src="Fit%20Peaks_files/image003.png" o:title=""/> 1266 1282 </v:shape><![endif]--><![if !vml]><img border=0 width=302 height=165 1267 src="Fit%20Peaks_files/image003.png" v:shapes=" Picture_x0020_29"><![endif]></span></p>1283 src="Fit%20Peaks_files/image003.png" v:shapes="_x0000_i1050"><![endif]></span></p> 1268 1284 1269 1285 <h2>Step 3: Determine Peak Positions</h2> … … 1282 1298 normal'><span style='font-family:"Calibri","sans-serif";mso-ascii-theme-font: 1283 1299 minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri; 1284 mso-bidi-theme-font:minor-latin'>Limits</span></b> window is erased). At this 1285 pointit is wise to zoom in on the data that will be used for indexing. </p>1300 mso-bidi-theme-font:minor-latin'>Limits</span></b> window is erased). At this point 1301 it is wise to zoom in on the data that will be used for indexing. </p> 1286 1302 1287 1303 <p class=MsoListParagraphCxSpMiddle style='margin-left:39.0pt;mso-add-space: … … 1295 1311 cropbottom="-1f" cropleft="35827f" cropright="19224f"/> 1296 1312 </v:shape><![endif]--><![if !vml]><img border=0 width=29 height=25 1297 src="Fit%20Peaks_files/image0 05.jpg" v:shapes="Picture_x0020_4"><![endif]></span>,1313 src="Fit%20Peaks_files/image029.jpg" v:shapes="Picture_x0020_4"><![endif]></span>, 1298 1314 then press the left mouse in one corner of the region to be used; holding the 1299 1315 mouse button down, drag over the region to the opposite corner; a box will be … … 1311 1327 cropbottom="-1f" cropleft="35827f" cropright="19224f"/> 1312 1328 </v:shape><![endif]--><![if !vml]><img border=0 width=31 height=27 1313 src="Fit%20Peaks_files/image0 06.jpg" v:shapes="Picture_x0020_5"><![endif]></span><span1329 src="Fit%20Peaks_files/image030.jpg" v:shapes="Picture_x0020_5"><![endif]></span><span 1314 1330 style='mso-spacerun:yes'> </span>button again to turn off the zoom mode. </p> 1315 1331 … … 1336 1352 1337 1353 <p class=MsoListParagraphCxSpMiddle style='margin-left:39.0pt;mso-add-space: 1338 auto'> and peaks are shown in the <b style='mso-bidi-font-weight:normal'><span1339 style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:minor-latin; 1340 m so-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri;mso-bidi-theme-font:1341 m inor-latin'>Peak List</span></b> window in order of increasing 2<span1342 style='font-family:Symbol'>Q</span>.</p>1354 auto'><span class=GramE>and</span> peaks are shown in the <b style='mso-bidi-font-weight: 1355 normal'><span style='font-family:"Calibri","sans-serif";mso-ascii-theme-font: 1356 minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri; 1357 mso-bidi-theme-font:minor-latin'>Peak List</span></b> window in order of 1358 increasing 2<span style='font-family:Symbol'>Q</span>.</p> 1343 1359 1344 1360 <p class=MsoListParagraphCxSpMiddle style='margin-left:39.0pt;mso-add-space: 1345 auto'><!--[if mso & !supportInlineShapes & supportFields]><span 1346 style='mso-element:field-begin;mso-field-lock:yes'></span><span 1347 style='mso-spacerun:yes'> </span>SHAPE <span 1348 style='mso-spacerun:yes'> </span>\* MERGEFORMAT <span style='mso-element:field-separator'></span><![endif]--><!--[if gte vml 1]><v:rect 1349 id="Picture_x0020_7" o:spid="_x0000_s1026" style='width:401.25pt;height:262.5pt; 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1363 visibility:visible;mso-wrap-style:square'> 1364 <v:imagedata src="Fit%20Peaks_files/image031.png" o:title=""/> 1365 </v:shape><![endif]--><![if !vml]><img border=0 width=535 height=350 1366 src="Fit%20Peaks_files/image031.png" v:shapes="Picture_x0020_29"><![endif]></span></p> 1395 1367 1396 1368 <p class=MsoListParagraphCxSpLast style='margin-left:39.0pt;mso-add-space:auto'>There … … 1420 1392 normal'><span style='font-family:"Calibri","sans-serif";mso-ascii-theme-font: 1421 1393 minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri; 1422 mso-bidi-theme-font:minor-latin'>Peak Fitting/LSQ PeakFit </span></b>on the<b1423 style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; 1424 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:1425 Calibri;mso-bidi-theme-font:minor-latin'> Peak List </span></b>window. Do <b 1426 style='mso-bidi-font-weight:normal'>NOT</b> use the <b style='mso-bidi-font-weight: 1427 normal'><span style='font-family:"Calibri","sans-serif";mso-ascii-theme-font: 1428 m inor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri;1429 mso-bidi-theme-font:minor-latin'>Calculate/Refine</span></b> menu item in the <b 1430 style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif";1394 mso-bidi-theme-font:minor-latin'>Peak Fitting/LSQ <span class=SpellE>PeakFit</span> 1395 </span></b>on the<b style='mso-bidi-font-weight:normal'><span style='font-family: 1396 "Calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-hansi-theme-font: 1397 minor-latin;mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin'> Peak 1398 List </span></b>window. Do <b style='mso-bidi-font-weight:normal'>NOT</b> use 1399 the <b style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; 1400 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family: 1401 Calibri;mso-bidi-theme-font:minor-latin'>Calculate/Refine</span></b> menu item 1402 in the <b style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; 1431 1403 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family: 1432 1404 Calibri;mso-bidi-theme-font:minor-latin'>GSAS-II data tree</span></b> window; 1433 that it to be used for Rietveld/Pawley refinements. You will be asked to save the1434 current project before the fit will proceed; change directory if desired and 1435 provide a suitable name (we assume <b style='mso-bidi-font-weight:normal'><span 1436 style=' font-family:"Calibri","sans-serif";mso-ascii-theme-font:minor-latin;1437 mso- hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri;mso-bidi-theme-font:1438 minor-latin'>LaB6</span></b>). A window will show the progress of the 1439 refinement and will close when the least-squares fit is complete (usually very 1440 fast). The plot is updated with the fit, the peak list windowis updated with1441 the new peak values and a summary of the refinement is shown on the console1442 window as well.</p>1405 that it to be used for <span class=SpellE>Rietveld</span>/Pawley refinements. 1406 You will be asked to save the current project before the fit will proceed; 1407 change directory if desired and provide a suitable name (we assume <b 1408 style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; 1409 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family: 1410 Calibri;mso-bidi-theme-font:minor-latin'>LaB6</span></b>). A window will show 1411 the progress of the refinement and will close when the least-squares fit <span 1412 class=GramE>is</span> complete (usually very fast). The plot is updated with 1413 the fit, the peak list window is updated with the new peak values and a summary 1414 of the refinement is shown on the console window as well.</p> 1443 1415 1444 1416 <p class=MsoListParagraphCxSpMiddle><span style='mso-no-proof:yes'><!--[if gte vml 1]><v:shape … … 1460 1432 style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]>Now 1461 1433 add refinement of the peak positions. This can be done by clicking on all the 1462 refinement flags for the individual peaks or it is possible to set them all at the1463 same time using this recipe: </p>1434 refinement flags for the individual peaks or it is possible to set them all at 1435 the same time using this recipe: </p> 1464 1436 1465 1437 <p class=MsoListParagraphCxSpMiddle style='margin-left:1.0in;mso-add-space: 1466 1438 auto;text-indent:-.25in;mso-list:l2 level2 lfo6'><![if !supportLists]><span 1467 1439 style='mso-fareast-font-family:"Times New Roman"'><span style='mso-list:Ignore'>a.<span 1468 style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]> single-click1469 on any value in the table to select it, for example the first peak position. A 1470 black box appears around the value. </p>1440 style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span 1441 class=GramE>single-click</span> on any value in the table to select it, for 1442 example the first peak position. A black box appears around the value. </p> 1471 1443 1472 1444 <p class=MsoListParagraphCxSpLast style='margin-left:1.0in;mso-add-space:auto; 1473 1445 text-indent:-.25in;mso-list:l2 level2 lfo6'><![if !supportLists]><span 1474 1446 style='mso-fareast-font-family:"Times New Roman"'><span style='mso-list:Ignore'>b.<span 1475 style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]>single-click 1476 on the <b style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; 1477 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin'>refine</span></b> 1478 label above the peak position check-boxes. The entire column of checkboxes is 1479 highlighted in blue. Press the <b style='mso-bidi-font-weight:normal'><span 1480 style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:minor-latin; 1481 mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri;mso-bidi-theme-font: 1482 minor-latin'>y</span></b> key to turn on all refinement flags (<b 1483 style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; 1484 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family: 1485 Calibri;mso-bidi-theme-font:minor-latin'>n</span></b> would turn them off).</p> 1447 style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span 1448 class=GramE>single-click</span> on the <b style='mso-bidi-font-weight:normal'><span 1449 style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:minor-latin; 1450 mso-hansi-theme-font:minor-latin'>refine</span></b> label above the peak 1451 position check-boxes. The entire column of checkboxes is highlighted in blue. 1452 Press the <b style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; 1453 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family: 1454 Calibri;mso-bidi-theme-font:minor-latin'>y</span></b> key to turn on all 1455 refinement flags (<b style='mso-bidi-font-weight:normal'><span 1456 style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:minor-latin; 1457 mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri;mso-bidi-theme-font: 1458 minor-latin'>n</span></b> would turn them off).</p> 1486 1459 1487 1460 <p class=MsoNormal style='margin-left:.5in'>Next, repeat the refinement using 1488 1461 the <b style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; 1489 1462 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family: 1490 Calibri;mso-bidi-theme-font:minor-latin'>Peak Fitting/LSQ PeakFit</span></b>1463 Calibri;mso-bidi-theme-font:minor-latin'>Peak Fitting/LSQ <span class=SpellE>PeakFit</span></span></b> 1491 1464 menu item in the <b style='mso-bidi-font-weight:normal'><span style='font-family: 1492 1465 "Calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-hansi-theme-font: … … 1497 1470 refinement. <span style='mso-fareast-font-family:"Times New Roman"'>This can be 1498 1471 performed in 2 different ways. Method 1: refine sigma (Gaussian 1499 width) and/or gamma (Lorentzian width) for individual peaks. To do this, 1500 click the refinement flags for sigma and/or gamma in the Peak List window. 1501 Method 2: preferably, the LS refinement of peak 1502 widths can be constrained to follow an instrumental broadening 1503 equation as described below. Note - one cannot refine ALL peak widths 1504 using both individual sigma & gamma values AND instrumental 1505 broadening terms at the same time.<b style='mso-bidi-font-weight:normal'> </b><o:p></o:p></span></p> 1472 width) and/or gamma (<span class=SpellE>Lorentzian</span> width) for individual 1473 peaks. To do this, click the refinement flags for sigma and/or gamma in 1474 the Peak List window. Method 2: preferably, the 1475 LS refinement of peak widths can be constrained to follow 1476 an instrumental broadening equation as described below. Note - one cannot 1477 refine ALL peak widths using both individual sigma & gamma values 1478 AND instrumental broadening terms at the same time.<b style='mso-bidi-font-weight: 1479 normal'> </b><o:p></o:p></span></p> 1506 1480 1507 1481 <p class=MsoNormal style='margin-left:.5in'><span style='mso-fareast-font-family: … … 1523 1497 1524 1498 <p class=MsoListParagraphCxSpFirst>The plot window shows the resolution curves 1525 corresponding to the values of the Gaussian U, V, W, Lorentzian X & Y 1526 coefficients; + marks show the individual values based on the sig & gam 1527 values for the peaks in Peak List. Select the refine flag checkbox for Gaussian 1499 corresponding to the values of the Gaussian U, V, W, <span class=SpellE>Lorentzian</span> 1500 X & Y coefficients; + marks show the individual values based on the sig 1501 & gam values for the peaks in Peak List. Select the refine flag checkbox 1502 for Gaussian <b style='mso-bidi-font-weight:normal'><span style='font-family: 1503 "Calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-hansi-theme-font: 1504 minor-latin;mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin'>U</span></b>, 1528 1505 <b style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; 1529 1506 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family: 1530 Calibri;mso-bidi-theme-font:minor-latin'>U</span></b>, <b style='mso-bidi-font-weight: 1531 normal'><span style='font-family:"Calibri","sans-serif";mso-ascii-theme-font: 1532 minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri; 1533 mso-bidi-theme-font:minor-latin'>V</span></b>, <b style='mso-bidi-font-weight: 1534 normal'><span style='font-family:"Calibri","sans-serif";mso-ascii-theme-font: 1535 minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri; 1536 mso-bidi-theme-font:minor-latin'>W</span></b>, and Lorentzian <b 1537 style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; 1507 Calibri;mso-bidi-theme-font:minor-latin'>V</span></b>, <b style='mso-bidi-font-weight: 1508 normal'><span style='font-family:"Calibri","sans-serif";mso-ascii-theme-font: 1509 minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri; 1510 mso-bidi-theme-font:minor-latin'>W</span></b>, and <span class=SpellE>Lorentzian</span> 1511 <b style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; 1538 1512 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family: 1539 1513 Calibri;mso-bidi-theme-font:minor-latin'>X</span></b>, <b style='mso-bidi-font-weight: … … 1551 1525 the <b style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; 1552 1526 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family: 1553 Calibri;mso-bidi-theme-font:minor-latin'>Peak Fitting/LSQ PeakFit</span></b>1527 Calibri;mso-bidi-theme-font:minor-latin'>Peak Fitting/LSQ <span class=SpellE>PeakFit</span></span></b> 1554 1528 menu item. At this point a good fit should be seen by zooming in on individual 1555 1529 peaks. For example see </p> … … 1562 1536 src="Fit%20Peaks_files/image011.png" v:shapes="Picture_x0020_11"><![endif]></span></p> 1563 1537 1564 <p class=MsoListParagraphCxSpLast>Notice that the peak position is slightly to 1565 the right of the peak top. This is a consequence of the peak asymmetry arising 1566 from axial divergence in the diffractometer. The Rwp is ~6% as shown on the 1567 c onsole window. Again the <b style='mso-bidi-font-weight:normal'><span1568 style=' font-family:"Calibri","sans-serif";mso-ascii-theme-font:minor-latin;1569 mso- hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri;mso-bidi-theme-font:1570 minor-latin'>Peak List</span></b> entries are all updated with new values and 1571 those in <b style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; 1572 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family: 1573 Calibri;mso-bidi-theme-font:minor-latin'>Instrument Parameters</span></b> are 1574 also updated.</p>1575 1576 <h2> Step 5.Prepare Indexing Peak List</h2>1577 1578 <p class=MsoNormal>A separate list of peaks is kept for use in autoindexing. It1579 is found in the <b style='mso-bidi-font-weight:normal'><span style='font-family:1580 "Calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:1581 minor-latin;mso- bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin'>Index1582 Peak List</span></b> item in the data tree. In the initially empty window 1583 created by this action, use menu item <b style='mso-bidi-font-weight:normal'><span 1584 style=' font-family:"Calibri","sans-serif";mso-ascii-theme-font:minor-latin;1585 mso- hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri;mso-bidi-theme-font:1586 minor-latin'>Index Peaks Operations/Load/Reload</span></b> to copy the fitted 1587 peaks from the <b style='mso-bidi-font-weight:normal'><span style='font-family: 1588 "Calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-hansi-theme-font: 1589 m inor-latin;mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin'>Peak1590 List</span></b>.</p>1538 <p class=MsoListParagraphCxSpLast>Notice that the peak position is slightly to the 1539 right of the peak top. This is a consequence of the peak asymmetry arising from 1540 axial divergence in the <span class=SpellE>diffractometer</span>. The <span 1541 class=SpellE>Rwp</span> is ~6% as shown on the console window. Again the <b 1542 style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; 1543 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family: 1544 Calibri;mso-bidi-theme-font:minor-latin'>Peak List</span></b> entries are all 1545 updated with new values and those in <b style='mso-bidi-font-weight:normal'><span 1546 style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:minor-latin; 1547 mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri;mso-bidi-theme-font: 1548 minor-latin'>Instrument Parameters</span></b> are also updated.</p> 1549 1550 <h2><span class=GramE>Step 5.</span> Prepare Indexing Peak List</h2> 1551 1552 <p class=MsoNormal>A separate list of peaks is kept for use in <span 1553 class=SpellE>autoindexing</span>. It is found in the <b style='mso-bidi-font-weight: 1554 normal'><span style='font-family:"Calibri","sans-serif";mso-ascii-theme-font: 1555 minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri; 1556 mso-bidi-theme-font:minor-latin'>Index Peak List</span></b> item in the data 1557 tree. In the initially empty window created by this action, use menu item <b 1558 style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; 1559 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family: 1560 Calibri;mso-bidi-theme-font:minor-latin'>Index Peaks Operations/Load/Reload</span></b> 1561 to copy the fitted peaks from the <b style='mso-bidi-font-weight:normal'><span 1562 style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:minor-latin; 1563 mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri;mso-bidi-theme-font: 1564 minor-latin'>Peak List</span></b>.</p> 1591 1565 1592 1566 <p class=MsoNormal><span style='mso-no-proof:yes'><!--[if gte vml 1]><v:shape … … 1601 1575 contaminant).</p> 1602 1576 1603 <h2> Step 6. Run Autoindexing</h2>1577 <h2><span class=GramE>Step 6.</span> Run <span class=SpellE>Autoindexing</span></h2> 1604 1578 1605 1579 <p class=MsoNormal>Select the <b style='mso-bidi-font-weight:normal'><span … … 1637 1611 src="Fit%20Peaks_files/image014.png" v:shapes="Picture_x0020_28"><![endif]></span></p> 1638 1612 1639 <h2> Step 7.Review Cell Choices</h2>1613 <h2><span class=GramE>Step 7.</span> Review Cell Choices</h2> 1640 1614 1641 1615 <p class=MsoNormal>Review the list of cells associated with the <b … … 1645 1619 Note that as one selects a unit cell, the generated reflections for that cell 1646 1620 are shown in the plot with dashed red lines. Sliding the cursor over these 1647 lines shows a small popup window with the indexed hkl for them. Note how the 1648 first cell in the list (M20~2970) with a=5.87864 Å generates very many lines 1649 with no corresponding peaks (NB: this solution might not always show up!)</p> 1621 lines shows a small popup window with the indexed <span class=SpellE>hkl</span> 1622 for them. Note how the first cell in the list (M20~2970) with a=5.87864 Å 1623 generates very many lines with no corresponding peaks (NB: this solution might 1624 not always show up!)</p> 1650 1625 1651 1626 <p class=MsoNormal><span style='mso-no-proof:yes'><!--[if gte vml 1]><v:shape … … 1657 1632 style='mso-spacerun:yes'> </span></p> 1658 1633 1659 <p class=MsoNormal> while the (M20~600) cell with a=2.93932 Å generates not1660 enough lines to match all the peaks</p>1634 <p class=MsoNormal><span class=GramE>while</span> the (M20~600) cell with 1635 a=2.93932 Å generates not enough lines to match all the peaks</p> 1661 1636 1662 1637 <p class=MsoNormal><span style='mso-no-proof:yes'><!--[if gte vml 1]><v:shape … … 1667 1642 src="Fit%20Peaks_files/image016.png" v:shapes="Picture_x0020_39"><![endif]></span></p> 1668 1643 1669 <h2> Step 8.Select/Refine Cell</h2>1644 <h2><span class=GramE>Step 8.</span> Select/Refine Cell</h2> 1670 1645 1671 1646 <p class=MsoNormal>Select the cell with M20 ~ 2970 with a = 4.15683 Å. This 1672 indexes all peaks with almost a perfect fit to the peak positions (compare 1673 dashedred lines to solid blue ones). Import the cell information using the <b1647 indexes all peaks with almost a perfect fit to the peak positions (compare dashed 1648 red lines to solid blue ones). Import the cell information using the <b 1674 1649 style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; 1675 1650 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family: … … 1683 1658 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family: 1684 1659 Calibri;mso-bidi-theme-font:minor-latin'>Cell Index/Refine/Refine Cell</span></b> 1685 menu option. The M20 improves to ~3600 and the a cell parameter value shifts from 1686 4.15683 to 4.15691 when zero is refined. (NB: The certificate value for NIST 1687 SRM 660a is 4.15692 Å). Press the <b style='mso-bidi-font-weight:normal'><span 1688 style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:minor-latin; 1689 mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri;mso-bidi-theme-font: 1690 minor-latin'>Show hkl positions </span></b>button to update the plot including 1691 the refined <b style='mso-bidi-font-weight:normal'><span style='font-family: 1692 "Calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-hansi-theme-font: 1693 minor-latin;mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin'>Zero 1694 offset</span></b> (in this case hardly anything happens!) </p> 1660 menu option. The M20 improves to ~3600 and <span class=GramE>the a</span> cell 1661 parameter value shifts from 4.15683 to 4.15691 when zero is refined. (NB: The 1662 certificate value for NIST SRM 660a is 4.15692 Å). Press the <b 1663 style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; 1664 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family: 1665 Calibri;mso-bidi-theme-font:minor-latin'>Show <span class=SpellE>hkl</span> 1666 positions </span></b>button to update the plot including the refined <b 1667 style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; 1668 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family: 1669 Calibri;mso-bidi-theme-font:minor-latin'>Zero offset</span></b> (in this case 1670 hardly anything happens!). <span style='mso-spacerun:yes'> </span></p> 1695 1671 1696 1672 <p class=MsoNormal><span style='mso-no-proof:yes'><!--[if gte vml 1]><v:shape … … 1711 1687 normal'><span style='font-family:"Calibri","sans-serif";mso-ascii-theme-font: 1712 1688 minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri; 1713 mso-bidi-theme-font:minor-latin'>Zero offset</span></b> is shown.</p> 1689 mso-bidi-theme-font:minor-latin'>Zero offset</span></b> is shown. NB: the <b 1690 style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; 1691 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin'>Show <span 1692 class=SpellE>hkl</span> positions</span></b> button has an additional use; you 1693 can enter the <span class=SpellE><b style='mso-bidi-font-weight:normal'><span 1694 style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:minor-latin; 1695 mso-hansi-theme-font:minor-latin'>Bravais</span></b></span><b style='mso-bidi-font-weight: 1696 normal'><span style='font-family:"Calibri","sans-serif";mso-ascii-theme-font: 1697 minor-latin;mso-hansi-theme-font:minor-latin'> lattice</span></b>, <b 1698 style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; 1699 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin'>Space group</span></b> 1700 & <b style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; 1701 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin'>Unit cell</span></b> 1702 for any material. Then pressing <b style='mso-bidi-font-weight:normal'><span 1703 style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:minor-latin; 1704 mso-hansi-theme-font:minor-latin'>Show <span class=SpellE>hkl</span> positions</span></b> 1705 will use that cell to index the lines in <b style='mso-bidi-font-weight:normal'><span 1706 style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:minor-latin; 1707 mso-hansi-theme-font:minor-latin'>Index Peak List</span></b>. This might be 1708 useful to identify e.g. a second phase in your pattern.</p> 1714 1709 1715 1710 <p class=MsoNormal>(Optional) Finally, use of the <b style='mso-bidi-font-weight: … … 1726 1721 mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri;mso-bidi-theme-font: 1727 1722 minor-latin'>Phases</span></b> (if it wasnt already present). This new phase 1728 can be used in future analysis (e.g. Rietveld or Pawley refinement).</p> 1723 can be used in future analysis (e.g. <span class=SpellE>Rietveld</span> or 1724 Pawley refinement).</p> 1729 1725 1730 1726 <p class=MsoNormal>To continue with the second part of this exercise, select … … 1736 1732 mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri;mso-bidi-theme-font: 1737 1733 minor-latin'>GSAS-II data tree </span></b>window. You will be asked if you want 1738 the current project saved; if <b style='mso-bidi-font-weight:normal'><span 1739 style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:minor-latin; 1740 mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri;mso-bidi-theme-font: 1741 minor-latin'>Yes</span></b> then all the peak fitting/indexing & cell 1742 refinement results will be saved to the <b style='mso-bidi-font-weight:normal'><span 1743 style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:minor-latin; 1744 mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri;mso-bidi-theme-font: 1745 minor-latin'>LaB6.gpx</span></b> file. If <b style='mso-bidi-font-weight:normal'><span 1746 style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:minor-latin; 1747 mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri;mso-bidi-theme-font: 1748 minor-latin'>No</span></b> then the file will remain as it was when created at 1749 Step 4 above.</p> 1750 1751 <h1><a name="kryptonite_peak_fit">2<sup>nd</sup> Fit Peaks/Autoindexing in 1752 GSAS-II</a> </h1> 1734 the current project saved; if <span class=GramE><b style='mso-bidi-font-weight: 1735 normal'><span style='font-family:"Calibri","sans-serif";mso-ascii-theme-font: 1736 minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri; 1737 mso-bidi-theme-font:minor-latin'>Yes</span></b></span> then all the peak 1738 fitting/indexing & cell refinement results will be saved to the <b 1739 style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; 1740 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family: 1741 Calibri;mso-bidi-theme-font:minor-latin'>LaB6.gpx</span></b> file. If <b 1742 style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; 1743 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family: 1744 Calibri;mso-bidi-theme-font:minor-latin'>No</span></b> then the file will 1745 remain as it was when created at Step 4 above.</p> 1746 1747 <h1><a name="kryptonite_peak_fit">2<sup>nd</sup> Fit Peaks/</a><span 1748 class=SpellE><span style='mso-bookmark:kryptonite_peak_fit'>Autoindexing</span></span><span 1749 style='mso-bookmark:kryptonite_peak_fit'> in GSAS-II</span> </h1> 1753 1750 1754 1751 <p class=MsoNormal>In this exercise we will fit peaks and index them for the 1755 new mineral <a href="http://en.wikipedia.org/wiki/Jadarite"> jadarite</a> (aka <a1756 href="http://en.wikipedia.org/wiki/Kryptonite">kryptonite</a>). The data were1757 also collected on 11BM-B at APS. The unit cell is monoclinic so it is a more 1758 substantial test of the indexing capability of GSAS-II.</p>1759 1760 <h2> Step 1.Read in the data. </h2>1752 new mineral <a href="http://en.wikipedia.org/wiki/Jadarite"><span class=SpellE>jadarite</span></a> 1753 (aka <a href="http://en.wikipedia.org/wiki/Kryptonite">kryptonite</a>). The 1754 data were also collected on 11BM-B at APS. The unit cell is monoclinic so it is 1755 a more substantial test of the indexing capability of GSAS-II.</p> 1756 1757 <h2><span class=GramE>Step 1.</span> Read in the data. </h2> 1761 1758 1762 1759 <p class=MsoNormal>The file is <b style='mso-bidi-font-weight:normal'><span … … 1764 1761 mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri;mso-bidi-theme-font: 1765 1762 minor-latin'>\Exercises\kryptonite\11bmb_6231.fxye</span></b>; it has a 1766 corresponding < b style='mso-bidi-font-weight:normal'><span style='font-family:1767 "Calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-hansi-theme-font: 1768 m inor-latin;mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin'>prm</span></b>1769 file. Load them in & the plot is</p>1763 corresponding <span class=SpellE><b style='mso-bidi-font-weight:normal'><span 1764 style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:minor-latin; 1765 mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri;mso-bidi-theme-font: 1766 minor-latin'>prm</span></b></span> file. Load them in & the plot is</p> 1770 1767 1771 1768 <p class=MsoNormal><span style='mso-no-proof:yes'><!--[if gte vml 1]><v:shape … … 1811 1808 </p> 1812 1809 1813 <h2>Step 4. Refine peaks</h2> 1814 1815 <p class=MsoNormal>Following the steps used in the LaB<sub>6</sub> example 1816 above, refine the peaks and the profile shape parameters in <b 1817 style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; 1818 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family: 1819 Calibri;mso-bidi-theme-font:minor-latin'>Instrument Parameters</span></b>. You 1820 will be asked for a project file name at the first refinement (I used <b 1821 style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; 1822 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family: 1823 Calibri;mso-bidi-theme-font:minor-latin'>jadarite</span></b>). In the end my 1824 refinement converged at Rwp=11.41% and some peaks do show some discrepancy as 1825 the sample is more complex than the simple <b style='mso-bidi-font-weight:normal'><span 1826 style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:minor-latin; 1827 mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri;mso-bidi-theme-font: 1828 minor-latin'>U</span></b>, <b style='mso-bidi-font-weight:normal'><span 1829 style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:minor-latin; 1830 mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri;mso-bidi-theme-font: 1831 minor-latin'>V</span></b>, <b style='mso-bidi-font-weight:normal'><span 1832 style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:minor-latin; 1833 mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri;mso-bidi-theme-font: 1834 minor-latin'>W</span></b>, <b style='mso-bidi-font-weight:normal'><span 1835 style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:minor-latin; 1836 mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri;mso-bidi-theme-font: 1837 minor-latin'>X</span></b>, <b style='mso-bidi-font-weight:normal'><span 1838 style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:minor-latin; 1839 mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri;mso-bidi-theme-font: 1840 minor-latin'>Y</span></b> model can accommodate. Make sure no peaks drift away during 1841 refinement (one weak one at ~6.67 is particularly troublesome). However, this 1842 is good enough to proceed.</p> 1843 1844 <h2>Step 5. Prepare Indexing Peak List</h2> 1810 <h2><span class=GramE>Step 4.</span> Refine peaks</h2> 1811 1812 <p class=MsoNormal>Following the steps used in the LaB<sub>6</sub> example above, 1813 refine the peaks and the profile shape parameters in <b style='mso-bidi-font-weight: 1814 normal'><span style='font-family:"Calibri","sans-serif";mso-ascii-theme-font: 1815 minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri; 1816 mso-bidi-theme-font:minor-latin'>Instrument Parameters</span></b>. You will be 1817 asked for a project file name at the first refinement (I used <span 1818 class=SpellE><b style='mso-bidi-font-weight:normal'><span style='font-family: 1819 "Calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-hansi-theme-font: 1820 minor-latin;mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin'>jadarite</span></b></span><b 1821 style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; 1822 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family: 1823 Calibri;mso-bidi-theme-font:minor-latin'></span></b>). In the end my 1824 refinement converged at <span class=SpellE>Rwp</span>=11.41% and some peaks do 1825 show some discrepancy as the sample is more complex than the simple <b 1826 style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; 1827 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family: 1828 Calibri;mso-bidi-theme-font:minor-latin'>U</span></b>, <b style='mso-bidi-font-weight: 1829 normal'><span style='font-family:"Calibri","sans-serif";mso-ascii-theme-font: 1830 minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri; 1831 mso-bidi-theme-font:minor-latin'>V</span></b>, <b style='mso-bidi-font-weight: 1832 normal'><span style='font-family:"Calibri","sans-serif";mso-ascii-theme-font: 1833 minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri; 1834 mso-bidi-theme-font:minor-latin'>W</span></b>, <b style='mso-bidi-font-weight: 1835 normal'><span style='font-family:"Calibri","sans-serif";mso-ascii-theme-font: 1836 minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri; 1837 mso-bidi-theme-font:minor-latin'>X</span></b>, <b style='mso-bidi-font-weight: 1838 normal'><span style='font-family:"Calibri","sans-serif";mso-ascii-theme-font: 1839 minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri; 1840 mso-bidi-theme-font:minor-latin'>Y</span></b> model can accommodate. Make sure 1841 no peaks drift away during refinement (one weak one at ~6.67 is particularly 1842 troublesome). However, this is good enough to proceed.</p> 1843 1844 <h2><span class=GramE>Step 5.</span> Prepare Indexing Peak List</h2> 1845 1845 1846 1846 <p class=MsoNormal>As before do <b style='mso-bidi-font-weight:normal'><span … … 1852 1852 mso-bidi-theme-font:minor-latin'>Index Peak List</span></b> window.</p> 1853 1853 1854 <h2> Step 6.Index the cell</h2>1854 <h2><span class=GramE>Step 6.</span> Index the cell</h2> 1855 1855 1856 1856 <p class=MsoNormal>Lets assume that we know the cell is primitive monoclinic. 1857 In a real world case we wouldnt know this and we would have to try each 1858 Bravais lattice. These can be done as a group, but it takes time to go through 1859 all the bad cases.</p>1857 In a real world case we wouldnt know this and we would have to try each <span 1858 class=SpellE>Bravais</span> lattice. These can be done as a group, but it takes 1859 time to go through all the bad cases.</p> 1860 1860 1861 1861 <p class=MsoNormal>Select <b style='mso-bidi-font-weight:normal'><span … … 1912 1912 space groups, pressing the <b style='mso-bidi-font-weight:normal'><span 1913 1913 style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:minor-latin; 1914 mso-hansi-theme-font:minor-latin'>Show hkl positions</span></b> each time to 1915 see which lines vanish. By sliding the cursor over the index lines without any 1916 visible peak you can see that the missing ones are 010, 100, 001, 110, 030, 1917 111, 20-1, 10-2, 041, 050, 21-2 & 23-1. Many of these are accidental but 1918 the 0k0; k≠2n and h0l; h+l≠2n ones characterize the space group P2<sub>1</sub>/n. 1919 Armed with this information you can <b style='mso-bidi-font-weight:normal'><span 1920 style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:minor-latin; 1921 mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri;mso-bidi-theme-font: 1922 minor-latin'>Make new phase</span></b> for the indexed cell (I called it <b 1923 style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; 1924 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family: 1925 Calibri;mso-bidi-theme-font:minor-latin'>kryptonite</span></b>) and select <b 1926 style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; 1927 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin'>Phases/kryptonite</span></b> 1928 from the GSAS-II data tree.</p> 1914 mso-hansi-theme-font:minor-latin'>Show <span class=SpellE>hkl</span> positions</span></b> 1915 each time to see which lines vanish. By sliding the cursor over the index lines 1916 without any visible peak you can see that the missing ones are 010, 100, 001, 1917 110, 030, 111, 20-1, 10-2, 041, 050, 21-2 & 23-1. Many of these are 1918 accidental but the 0k0; k≠2n and h0l; h+l≠2n ones characterize the 1919 space group P2<sub>1</sub>/n. Armed with this information you can <b 1920 style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; 1921 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family: 1922 Calibri;mso-bidi-theme-font:minor-latin'>Make new phase</span></b> for the 1923 indexed cell (I called it <b style='mso-bidi-font-weight:normal'><span 1924 style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:minor-latin; 1925 mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri;mso-bidi-theme-font: 1926 minor-latin'>kryptonite</span></b>) and select <b style='mso-bidi-font-weight: 1927 normal'><span style='font-family:"Calibri","sans-serif";mso-ascii-theme-font: 1928 minor-latin;mso-hansi-theme-font:minor-latin'>Phases/kryptonite</span></b> from 1929 the GSAS-II data tree.</p> 1929 1930 1930 1931 <p class=MsoNormal><span style='mso-no-proof:yes'><!--[if gte vml 1]><v:shape … … 1946 1947 src="Fit%20Peaks_files/image023.png" v:shapes="Picture_x0020_23"><![endif]></span></p> 1947 1948 1948 <p class=MsoNormal>This concludes this exercise; < b style='mso-bidi-font-weight:1949 normal'><span style='font-family:"Calibri","sans-serif";mso-ascii-theme-font: 1950 m inor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri;1951 mso-bidi-theme-font:minor-latin'>Save</span></b> the project file as it is 1952 needed for the <b style='mso-bidi-font-weight:normal'><span style='font-family: 1953 "Calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-hansi-theme-font: 1954 m inor-latin;mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin'><a1955 href="Charge%20Flipping%20in%20GSAS.htm">Charge Flipping</a></span></b>1949 <p class=MsoNormal>This concludes this exercise; <span class=GramE><b 1950 style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; 1951 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family: 1952 Calibri;mso-bidi-theme-font:minor-latin'>Save</span></b></span> the project file 1953 as it is needed for the <b style='mso-bidi-font-weight:normal'><span 1954 style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:minor-latin; 1955 mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri;mso-bidi-theme-font: 1956 minor-latin'><a href="Charge%20Flipping%20in%20GSAS.htm">Charge Flipping</a></span></b> 1956 1957 exercise. The features of the <b style='mso-bidi-font-weight:normal'><span 1957 1958 style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:minor-latin; … … 1959 1960 minor-latin'>Phase Data</span></b> window will be presented in other exercises.</p> 1960 1961 1961 <h1><a name="sucrose_peak_fit"></a>3<sup>rd</sup> Fit Peaks/ Autoindexing in1962 GSAS-II </h1>1962 <h1><a name="sucrose_peak_fit"></a>3<sup>rd</sup> Fit Peaks/<span class=SpellE>Autoindexing</span> 1963 in GSAS-II </h1> 1963 1964 1964 1965 <p class=MsoNormal>In this exercise we will fit peaks and index them for … … 1971 1972 is a more substantial test of the indexing capability of GSAS-II.</p> 1972 1973 1973 <h2> Step 1.Read in the data. </h2>1974 <h2><span class=GramE>Step 1.</span> Read in the data. </h2> 1974 1975 1975 1976 <p class=MsoNormal>The file is <b style='mso-bidi-font-weight:normal'><span … … 1977 1978 mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri;mso-bidi-theme-font: 1978 1979 minor-latin'>\Exercises\sucrose\11bmb_8716.fxye</span></b>; it has a 1979 corresponding <b style='mso-bidi-font-weight:normal'><span style='font-family: 1980 corresponding <span class=SpellE><b style='mso-bidi-font-weight:normal'><span 1981 style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:minor-latin; 1982 mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri;mso-bidi-theme-font: 1983 minor-latin'>prm</span></b></span> file and is for Domino® sugar ground under 1984 acetone. <span class=GramE>The other <span class=SpellE><b style='mso-bidi-font-weight: 1985 normal'><span style='font-family:"Calibri","sans-serif";mso-ascii-theme-font: 1986 minor-latin;mso-hansi-theme-font:minor-latin'>fxye</span></b></span> file in 1987 this directory <b style='mso-bidi-font-weight:normal'><span style='font-family: 1980 1988 "Calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-hansi-theme-font: 1981 minor-latin;mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin'>prm</span></b> 1982 file and is for Domino® sugar ground under acetone. The other <b 1983 style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; 1984 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin'>fxye</span></b> 1985 file in this directory <b style='mso-bidi-font-weight:normal'><span 1986 style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:minor-latin; 1987 mso-hansi-theme-font:minor-latin'>11bmb_8714.fxye</span></b> is for Domino® 10X 1988 powdered sugar used as is out of the box. Load the <b style='mso-bidi-font-weight: 1989 normal'><span style='font-family:"Calibri","sans-serif";mso-ascii-theme-font: 1990 minor-latin;mso-hansi-theme-font:minor-latin'>8716</span></b> file in & the 1991 plot is</p> 1989 minor-latin'>11bmb_8714.fxye</span></b> is for Domino® 10X powdered sugar used 1990 as is out of the box.</span> Load the <b style='mso-bidi-font-weight:normal'><span 1991 style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:minor-latin; 1992 mso-hansi-theme-font:minor-latin'>8716</span></b> file in & the plot is</p> 1992 1993 1993 1994 <p class=MsoNormal><span style='mso-no-proof:yes'><!--[if gte vml 1]><v:shape … … 1999 2000 2000 2001 <p class=MsoNormal>Ive zoomed in & shifted the plot some to highlight the 2001 lower part of the pattern; Ive also chosen to plot the square root of the intensity2002 (use <b style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; 2003 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin'>S</span></b> 2004 key) as this shows weak peaks better.</p>2002 lower part of the pattern; Ive also chosen to plot the square root of the 2003 intensity (use <b style='mso-bidi-font-weight:normal'><span style='font-family: 2004 "Calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-hansi-theme-font: 2005 minor-latin'>S</span></b> key) as this shows weak peaks better.</p> 2005 2006 2006 2007 <h2>Step 2 Set limits</h2> … … 2023 2024 can be moved by dragging the peak line and peaks can be deleted by 2024 2025 right-clicking on them. This only works when the zoom and reposition modes 2025 (below) are not selected. Also note the shoulder at ~6.3 deg that should be2026 added to the list. I skipped a couple of very weak peaks; the total list has 2027 >28 peaks.</p>2026 (below) are not selected. Also note the shoulder at ~6.3 <span class=SpellE>deg</span> 2027 that should be added to the list. I skipped a couple of very weak peaks; the total 2028 list has >28 peaks.</p> 2028 2029 2029 2030 <p class=MsoNormal><span style='mso-no-proof:yes'><!--[if gte vml 1]><v:shape … … 2036 2037 </p> 2037 2038 2038 <h2> Step 4.Refine peaks</h2>2039 <h2><span class=GramE>Step 4.</span> Refine peaks</h2> 2039 2040 2040 2041 <p class=MsoNormal>Following the steps used in the LaB<sub>6</sub> and … … 2047 2048 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family: 2048 2049 Calibri;mso-bidi-theme-font:minor-latin'>sucrose</span></b>). In the end my 2049 refinement converged at Rwp=7.15% and some peaks do show some discrepancy as2050 the sample is more complex than the simple <b style='mso-bidi-font-weight:normal'><span 2051 style=' font-family:"Calibri","sans-serif";mso-ascii-theme-font:minor-latin;2052 mso- hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri;mso-bidi-theme-font:2053 minor-latin'>U</span></b>, <b style='mso-bidi-font-weight:normal'><span 2054 style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:minor-latin; 2055 m so-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri;mso-bidi-theme-font:2056 m inor-latin'>V</span></b>, <b style='mso-bidi-font-weight:normal'><span2057 style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:minor-latin; 2058 m so-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri;mso-bidi-theme-font:2059 m inor-latin'>W</span></b>, <b style='mso-bidi-font-weight:normal'><span2060 style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:minor-latin; 2061 m so-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri;mso-bidi-theme-font:2062 m inor-latin'>X</span></b>, <b style='mso-bidi-font-weight:normal'><span2063 style='font-family:"Calibri","sans-serif";mso-ascii-theme-font:minor-latin; 2064 m so-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri;mso-bidi-theme-font:2065 m inor-latin'>Y</span></b> model can accommodate. Make sure no peaks drift away2066 during refinement. However, this is good enough to proceed.</p>2067 2068 <h2> Step 5.Prepare Indexing Peak List</h2>2050 refinement converged at <span class=SpellE>Rwp</span>=7.15% and some peaks do 2051 show some discrepancy as the sample is more complex than the simple <b 2052 style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; 2053 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family: 2054 Calibri;mso-bidi-theme-font:minor-latin'>U</span></b>, <b style='mso-bidi-font-weight: 2055 normal'><span style='font-family:"Calibri","sans-serif";mso-ascii-theme-font: 2056 minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri; 2057 mso-bidi-theme-font:minor-latin'>V</span></b>, <b style='mso-bidi-font-weight: 2058 normal'><span style='font-family:"Calibri","sans-serif";mso-ascii-theme-font: 2059 minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri; 2060 mso-bidi-theme-font:minor-latin'>W</span></b>, <b style='mso-bidi-font-weight: 2061 normal'><span style='font-family:"Calibri","sans-serif";mso-ascii-theme-font: 2062 minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri; 2063 mso-bidi-theme-font:minor-latin'>X</span></b>, <b style='mso-bidi-font-weight: 2064 normal'><span style='font-family:"Calibri","sans-serif";mso-ascii-theme-font: 2065 minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:Calibri; 2066 mso-bidi-theme-font:minor-latin'>Y</span></b> model can accommodate. Make sure 2067 no peaks drift away during refinement. However, this is good enough to proceed.</p> 2068 2069 <h2><span class=GramE>Step 5.</span> Prepare Indexing Peak List</h2> 2069 2070 2070 2071 <p class=MsoNormal>As before do <b style='mso-bidi-font-weight:normal'><span … … 2076 2077 mso-bidi-theme-font:minor-latin'>Index Peak List</span></b> window.</p> 2077 2078 2078 <h2> Step 6.Index the cell</h2>2079 <h2><span class=GramE>Step 6.</span> Index the cell</h2> 2079 2080 2080 2081 <p class=MsoNormal>Lets assume that we know the cell in primitive monoclinic. 2081 In a real world case we wouldnt know this and we would have to try each 2082 Bravais lattice. These can be done as a group, but it takes time to go through 2083 all the bad cases.</p>2082 In a real world case we wouldnt know this and we would have to try each <span 2083 class=SpellE>Bravais</span> lattice. These can be done as a group, but it takes 2084 time to go through all the bad cases.</p> 2084 2085 2085 2086 <p class=MsoNormal>Select <b style='mso-bidi-font-weight:normal'><span … … 2131 2132 slightly different lattice parameters. Try different space groups, pressing the 2132 2133 <b style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; 2133 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin'>Show hkl2134 positions</span></b> each time to see which lines vanish. The correct space 2135 group is P2<sub>1</sub>. Armed with this information you can <b 2136 style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif";2134 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin'>Show <span 2135 class=SpellE>hkl</span> positions</span></b> each time to see which lines 2136 vanish. The correct space group is P2<sub>1</sub>. Armed with this information 2137 you can <b style='mso-bidi-font-weight:normal'><span style='font-family:"Calibri","sans-serif"; 2137 2138 mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family: 2138 2139 Calibri;mso-bidi-theme-font:minor-latin'>Make new phase</span></b> for the -
TabularUnified trunk/help/Fit Peaks_files/filelist.xml ¶
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