| 1 | <html> |
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| 2 | <head> |
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| 3 | <META NAME="Author" CONTENT="Brian H. Toby"> |
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| 4 | <title>EXPGUI</title> |
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| 5 | </head> |
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| 6 | <BODY BGCOLOR="#FFFFFF"> |
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| 7 | |
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| 8 | <A HREF=http://www.ncnr.nist.gov> |
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| 9 | <IMG SRC="http://www.ncnr.nist.gov/images/ncnrtrans.gif" |
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| 10 | alt="Link to NIST Center for Neutron Research home page" |
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| 11 | ALIGN=RIGHT></A> |
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| 12 | <A HREF=http://www.nist.gov> |
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| 15 | ALIGN=LEFT></A> |
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| 16 | <CENTER> |
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| 17 | <A Href="http://www.ncnr.nist.gov/programs/crystallography/software/tclpkgs.html"> |
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| 18 | <IMG SRC="tcltklogo100.gif" |
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| 19 | alt="Link to Tcl/Tk information"> |
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| 20 | </CENTER></A> |
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| 21 | <hr> |
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| 22 | |
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| 23 | <center><h1> |
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| 24 | EXPGUI |
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| 25 | </h1></center> |
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| 26 | <A Href="expgui.html">EXPGUI top</A> |
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| 27 | |
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| 28 | <h3>A.7 Preferential Orientation Pane</h3></a> |
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| 29 | <DL><DL> |
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| 30 | The Preferential Orientation Pane is used to control parameters related |
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| 31 | to fitting parameters using the March-Dollase formulation |
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| 32 | for preferred orientation. In this model one or more axes are designated |
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| 33 | as directions [designated by (<i>hkl</i>)] where crystallites are over |
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| 34 | (Ratio > 1) or underrepresented (Ratio < 1). |
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| 35 | The checkbox to the right of the Ratio value determines if it will |
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| 36 | be refined. |
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| 37 | </DL></DL> |
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| 38 | <img SRC="po1.gif" align=TEXTTOP> |
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| 39 | <DL><DL> |
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| 40 | If more than one axis is present, one must define the relative fraction |
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| 41 | of preferred orientation for each direction. These fractions are normalized, |
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| 42 | so do not vary the fractions for all directions in a phase. |
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| 43 | </DL></DL> |
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| 44 | <img SRC="po2.gif" align=TEXTTOP> |
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| 45 | <DL><DL> |
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| 46 | If |
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| 47 | <A href="expgui.html#multiplehistogram"> |
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| 48 | "Multiple Histogram Selection" mode</A> is set to any value other than |
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| 49 | "Off", all terms are displayed for all selected histograms. |
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| 50 | No attempt is made to group terms or flags. |
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| 51 | <P> |
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| 52 | Note that the other model for treating preferred orientation -- the orientation |
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| 53 | distribution function (spherical harmonics) is not yet implemented |
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| 54 | in EXPGUI and must be accessed from EXPEDT. |
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| 55 | </DL></DL> |
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| 56 | |
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| 57 | <hr> |
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| 58 | <A Href="expgui.html">EXPGUI top</A> |
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| 59 | |
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| 60 | <p><a href="http://www.ncnr.nist.gov/staff/toby/">Brian Toby</a> (<a href="mailto:brian.toby@nist.gov">Brian.Toby@NIST.GOV</a>) |
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| 61 | <br> |
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| 62 | $Revision: 224 $ $Date: 2009-12-04 23:02:28 +0000 (Fri, 04 Dec 2009) $ |
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| 63 | </body> |
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| 64 | </html> |
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