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<p class="MsoNormal"><span lang="IT">Dear all,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="IT"><o:p> </o:p></span></p>
<p class="MsoNormal">I am new to GSAS II and have no experience with old-GSAS, so forgive me for the basic level of the questions.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I don’t fully understand the meaning of the parameters describing the instrumental profile.
<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">�<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>What is Z? I could not find it in the old-GSAS manual.
<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">�<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>How can I judge if the U V W X Y Z are reasonable? (in case I don’t have a reference profile from a standard) And how should a well behaved peak width plot look like?<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">�<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>I read that U W X Y are constrained to be >= 0, while V should be <= 0. However I have a not so badly-fitted plot where U refined to very negative, V to very positive, W is small and negative, X is positive and Y negative. So
(i) those parameters have no constraint by default!Why not? Can I do it with equations?; (ii) even from my na�ve understanding it looks like a nonsense. Most likely it is because I have broad peaks and the interplay between strain/size/etc and instrumental
parameters converged to this artificial mess. Is it possible to deconvolute the instrument contribution from the sample contribution, in absence of a standard?<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">�<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]>SH/L is one unique parameter as opposed to 2 separate parameters in old-GSAS, what is its meaning now, the units and/or reasonable range?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">If you can help with even partial answers or point out useful sources of information, I will be grateful!<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Kind regards, <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Arianna<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b><span lang="IT">,_,.-'���'-.,_,.-'���'-.,_,.-'���'-.,_,,.-'���'-.,_,.-'���'-.,_,<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span lang="IT" style="color:#385623"><o:p> </o:p></span></b></p>
<p class="MsoNormal"><b><span lang="IT">Arianna Lanza</span></b><span lang="IT">, PhD<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="IT"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="IT" style="color:#4472C4">Center for Nanotechnology Innovation@NEST<br>
<b>Istituto Italiano di Tecnologia</b></span><span lang="IT"><br>
Piazza San Silvestro, 12, 56127, PISA, Italy</span><span lang="IT" style="color:#70AD47"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="IT"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="IT"><o:p> </o:p></span></p>
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