Dear Rietvelders:
P.S. I should mention that with that background of only 2 counts, the
maximum signal was around 2000 counts.
Thanks to everyone for all the help so far.
- Kurt
-Original Message-
From: Jon Wright [mailto:[EMAIL PROTECTED]
Sent: Friday,
Hi Jon,
Funny you should mention the background... it was very low, as you say.
Above 30 degrees the background averaged only 2 counts, with a minimum
of 1 count and a maximum of 3 counts, throughout the rest of the
spectrum. Scan time was 2 hours.
I also found that there was some kalpha2 in the
BTW,
there are no statistically sound weights in Rietveld refinement :-)
Lubo
On Fri, 15 Feb 2008, Von Dreele, Robert B. wrote:
Hi Kurt,
If you plot the results in POWPLOT & do the "statistical analysis" what does
the delt/sig vs 2-theta plot look like? If weights are right then the band of d
Hi Kurt,
If you plot the results in POWPLOT & do the "statistical analysis" what does
the delt/sig vs 2-theta plot look like? If weights are right then the band of
delt/sig ought to be roughly 2-3 sig wide. Is your data in cpm? Some
instruments make that by default. That will mess up the R-facto
Kurt Leinenweber wrote:
... with wRp of 25% and crystallographic R also near 25% ..
Maybe the background is too low :-?
Jon
Dear Kurt,
The only thing that I remember is to change cos(2theta) of monochromator
in polarization factor or precisely calculate the polarization factor
for n-reflection in the monochromator.
Regards
Sasaki
Kurt Leinenweber escreveu:
Hi All,
I am attempting to assist others to choose a new
