Dear Lister,
if any Rietan2000 user could contact me off-list please, I am having trouble
to get the program to work
Best Regards,
Ralf
-
Dr. Ralf Theissmann
Universität Duisburg-Essen
Fakultät für Ingenieurwissenschaften
Dear All,
How is life with conventional R factors when you always have to divide
by zero background?
Let's have time. Considering a part of the profile without peaks one
gets 100% cR.
I did not give the agreement factor; I would say those cR with all
non-excluded points is incorrect, but cR
Background removal is verbotten!
Brian O'Connor
From: Olga Smirnova [mailto:olga.smirn...@hw7.ecs.kyoto-u.ac.jp]
Sent: Wed 4/03/2009 2:14 PM
To: rietveld_l@ill.fr
Subject: cRs
Dear All,
How is life with conventional R factors when you always have to divide
by
It's German... verboten == forbidden.
You should never delete the background from a diffraction pattern prior to
(Rietveld) analysis.
It changes peak positions and shapes and generally is bad.
Cheers
Matthew
Matthew Rowles
CSIRO Minerals
Box 312
Clayton South, Victoria
As far as I understand, the major issue is that BG subtraction changes the
error statistics (accordingly, weights applied in calculating function to
minimize...). It is also somewhat arbitrary how you choose the BG line - so,
you can easily subtract part of Bragg contribution from base of peak
