Dear All,
I have two questions concerning the polarization factor in GSAS. I am
analyzing synchrotron x-ray diffraction patterns and to work out the
diffractometer constants I refined a silicon pattern. My questions are:
1.What is the formula for the RBVD Lp correction? Is it the third formula on
page 125 of the manual?
2. The pattern was refined using the RBVD correction. The refined
polarization fraction POLA reaches a value of 1.14 (the initial value was
set to 0.95) is it possible?
The experiment was carried out in Debye-Scherrer geometry with an incident
beam monochromator and the patterns were collected using imaging plates.
The camera radius is 573mm, the sample was placed in 0.3mm glass capillary.
The refinement includes absorption correction and corrections to the silicon
scattering factor (f' and f"). Wavelength= 1.796A, the angular range
is 5-150deg.
Best regards
M. Schmidt
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Marek W. Schmidt
Department of Applied Mathematics
Research School of Physical Sciences and Engineering
Australian National University
Canberra ACT 0200, AUSTRALIA
email: [EMAIL PROTECTED]
facsimile: 61-2-6249 0732
telephone: 61-2-6249 0381
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