Hi Mike,
If he plots in d then neither of the components will have the right d-spacing
when he uses the average - but you're right that its standard procedure.
- Kurt
*********
Kurt Leinenweber
Dept. of Chemistry and Biochemistry
Arizona State University
Tempe, AZ 85287-1604
phone (480)-965-8853
fax (480)-965-2747
***********
-----Original Message-----
From: Michael Glazer [mailto:m.glaz...@physics.ox.ac.uk]
Sent: Friday, January 15, 2010 9:49 AM
To: Kurt Leinenweber; Franz Werner; rietveld_l@ill.fr
Subject: RE: Comparison of powder patterns recorded at different wavelengths
Kurt
The standard method is to use a wavelength made from the weighted (2:1) average
of the two components. So for CuKa the standard value is 1.5418 angstroms
Mike Glazer
-----Original Message-----
From: Kurt Leinenweber [mailto:ku...@asu.edu]
Sent: 15 January 2010 16:46
To: Franz Werner; rietveld_l@ill.fr
Subject: RE: Comparison of powder patterns recorded at different wavelengths
HI Franz,
It seems to me that the best thing would be to use K alpha 1 wavelength (which
is 66 percent of the total intensity) and then mentally ignore the K alpha 2
contribution. The other option is to strip the original data of K alpha 2, if
your diffractometer's software has that option, but since stripping is a kind
of data manipulation, I don't usually like doing it.
- Kurt
*********
Kurt Leinenweber
Dept. of Chemistry and Biochemistry
Arizona State University
Tempe, AZ 85287-1604
phone (480)-965-8853
fax (480)-965-2747
***********
-----Original Message-----
From: Franz Werner [mailto:franzwer...@gmx.at]
Sent: Friday, January 15, 2010 6:27 AM
To: rietveld_l@ill.fr
Subject: Comparison of powder patterns recorded at different wavelengths
Hello Rietvelders
I want to compare graphically powder patterns of a phase which were recorded at
different wavelengths. Therefore I'd like to overlay the patterns using
d-values, calculated from their corresponding 2theta values. In the case of
monochromatic X-rays it's trivial. But which wavelength should one use in the
case of Kalpha1-Kalpha2 radiation (lab instrument)?
Thanks for your help.
Regards
Franz Werner
Tallinn University of Technology
Estonia
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