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
