Axial divergence

vkahlen@zfn.uni-bremen.de
Thu, 30 Oct 1997 12:15:58 +0100

Hello everybody !

I try to refine a powder pattern showing strong peak asymmetry due to
axial divergence using the approach of Finger, Cox and Jephcoat implemented
in the GSAS program. The pattern was measured on a conventional diffractometer
in Bragg-Brentano geometry with Cu K alpha1 radiation ( primary monochromator )
and Soller slits.
Whenever I try to introduce the S/L and H/L ratios in the calculations the
refinement becomes unstable and diverges. Has anybody gained experience in
using this asymmetry correction ? Is there someting special to consider ?

Many thanks in advance,

Volker