# Changeset 2395 for Tutorials/SAfit/Fitting Small Angle Scattering Data.htm

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Jul 28, 2016 2:29:57 PM (7 years ago)
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• ## Tutorials/SAfit/Fitting Small Angle Scattering Data.htm

 r1740 Von DreeleVon Dreele7820962014-05-01T13:58:00Z2015-03-18T17:50:00Z2016-07-28T19:29:00Z11448825814478254Argonne National Laboratory6819968715.00968216.00 Clean Clean false mso-font-charset:1; mso-generic-font-family:roman; mso-font-format:other; mso-font-pitch:variable; mso-font-signature:0 0 0 0 0 0;} mso-hansi-font-family:"Courier New"; mso-bidi-font-family:"Courier New";} p.msonormal0, li.msonormal0, div.msonormal0 {mso-style-name:msonormal; mso-style-noshow:yes; mso-style-priority:99; mso-style-unhide:no; mso-margin-top-alt:auto; margin-right:0in; mso-margin-bottom-alt:auto; margin-left:0in; mso-pagination:widow-orphan; font-size:12.0pt; font-family:"Times New Roman",serif; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast;} span.DocumentMapChar {mso-style-name:"Document Map Char"; {mso-style-name:""; mso-spl-e:yes;} span.GramE {mso-style-name:""; mso-gram-e:yes;} .MsoChpDefault {mso-style-type:export-only;

In this tutorial you will fit small angle scattering data for an alumina polishing powder using data from a constant wavelength synchrotron X-ray USAXS instrument. You will use both a lognormal distribution of spherical particles model and a unified Guinier-Porod model. The data were collected from powders spread onto sticky tape and covered with another layer of the same tape. The data were corrected for background using data collected from two layers of sticky tape. However, the sample thickness is not accurately known Guinier-Porod model. The data were collected from powders spread onto sticky tape and covered with another layer of the same tape. The data were corrected for background using data collected from two layers of sticky tape. However, the sample thickness is not accurately known so the data are not intensity and estimated standard deviation in intensity; there may be a header with metadata information in the front of this file.  Change the file directory to   Change the file directory to SAsizeexercises/SAsize/dataOpen. There will be a Dialog box asking Is this the file you want? Press Yes button to proceed.

minor-latin'>Is this the file you want? Press Yes button to proceed.

At this point the

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might not work). Check the Refine? boxes for these parameters. Do Models/Fit to do the least squares refinement; convergence will occur very quickly. NB: if the refinement messes up, you can recover the previous result; do Models/Undo to recover. Then add the two Dist Mean and Refine? boxes for these parameters. Do Models/Fit to do the least squares refinement; convergence will occur very quickly. NB: if the refinement messes up, you can recover the previous result; do Models/Undo to recover. Then add the two Dist P parameters to the refinement, again convergence is easily obtained. Finally, add the two Mean
and Dist StdDev and Dist Cutoff parameters (a total of ten) to the list. The result is a really nice fit to the data with reasonable values; the console window shows the full results of the refinement

mso-hansi-theme-font:minor-latin'> P parameters to the refinement, again convergence is easily obtained. Finally, add the two Dist StdDev and Dist Cutoff parameters (a total of ten) to the list. The result is a really nice fit to the data with reasonable values; the console window shows the full results of the refinement

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