Brian wrote:
>U and W should be instrumental constants that will not change with >sample,
>while V can have both an instrumental and a
>residual stress component.
Maxim wrote:
>as far as I understand, the strain broadening term should have FWMM~theta
>>dependence, i.e. Lorentzian Y in "standard" (GSAS) notation.
>For the Gaussian part you have
>FWHM^2=U*tan^2(th)+V*tan(th)+W+P/cos^2(th)
>and the term that varies roughly as ~theta is U, not V.
>Therefore, based on that and probably erroneously, I used to refine U
>>parameter rather than V (+ P, X, Y, of course).
>I am wondering if somebody could make this more clear?
Dear Brian and Maxim,
In fact, the term responsible for the Gaussian strain component is U, not V.
Regards,
Leonid
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Leonid A. Solovyov
Institute of Chemistry and Chemical Technology
660049, K. Marx 42, Krasnoyarsk, Russia
www.icct.ru/eng/content/persons/Sol_LA
www.geocities.com/l_solovyov
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