>
> I presume that you want to use Pearson VII to fit low angle profiles
>as those peaks are assymetric. It sounds like you have significant axial
>divergence. Have you tried Jephcoat,Finger, Cox modification to
>Pseudo-voight (profile function 3 in GSAS)? It usually dose a very good job
>of fitting axial divergence.
>
> Another solution might be to use longer wavelength radiation and
>push the critical peaks to higher angles where axial divergence will not be
>as severe.
I have tried function 3 without any joy, and I'm not able to repeat the
experiment using longer wavelengths. I am, therefore, still seeking help.
Best wishes,
Colin.
