Dear Marc Hostettler,
Thank you for help.
I should calculate FWHMxxx in the widplt (U,V,W,P,LX,LY) with Sxxx replace the LY. I
will give it a try.

Sean X. Ouyang


Marc Hostettler wrote:

> On Thu, 22 Mar 2001, Xiang Ouyang wrote:
>
> > Hello Colleagues,
> > In GSAS CW profile #4, there are parameter U, V, W, P and LX, but no LY. how
> > should the FWHM be calculated?
> > I used Widplt  (in Brian Toby's EXPGUI) to plot the FWHM  of a pattern fit with
> > profile #4 and the FWHM  descent with 2 theta (U = 0, V = -2.3, W = 3.75, P = 0,
> > LX = 0.8, eta = .6). Any help?
>
> Peak profile type no. 4 in GSAS allow to modelize anisotropic peak
> broadening (see Stephens J.Appl.Cryst. 1999), therefore LY is parametrized
> for each set of reflections H00, 0K0, HK0... The corresponding parameters
> being S400, S040, S220...
>
> Best,
>
> Marc Hostettler
> Lausanne

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