I recently have tried, for the first time, the fundamental parameters
approach to fitting powder diffraction data using the XFIT program. To the
best of my knowledge I am using a reasonably well aligned system (with a
theta compensating slit in place of a fixed divergence slit), yet when I
refine on all of the geometrical and instrumental parameters the projected
x-ray source width (nominally 0.04 mm at about 6 degree takeoff angle) and
the receiving slit width (0.2 mm) both refine to values near zero while the
remaining parameters seem reasonable. I would appreciate any insights on
this problem.
Karl M. Unruh Be very, very careful what you put into
Department of Physics that head, because you will never, ever
and Astronomy get it out.
University of Delaware
Newark, DE 19716
Cardinal Wolsey
