Dear Kurt,
It seems that the problem is in wrong sample-to-detector distance which results
in the nearly linear angular dependence of the peak displacement.
Regards,
Leonid
*********************************************************
Leonid A. Solovyov
Institute of Chemistry and Chemical Technology
660049, K. Marx 42, Krasnoyarsk, Russia
www.icct.ru/eng/content/persons/Sol_LA
www.geocities.com/l_solovyov
*********************************************************
--- On Thu, 1/8/09, Kurt Leinenweber <ku...@asu.edu> wrote:
> (I hope this list is appropriate for this question). I am
> trying to set
> up a new D8 diffractometer from Bruker, and have it set up
> with a Vario
> monochromator focusing on a sample in a capillary. Of
> course I hope to
> do Rietveld refinement on the samples eventually. But
> there is an error
> in two theta of the peak positions on all samples, and the
> error is
> linear in two theta. At 40 degrees the error (measured
> minus expected)
> is about 0.020 degrees, at 80 degrees the error is about
> 0.040 degrees,
> etcetera.
>
>
>
> Has anyone ever seen anything like this and do you know
> where it could
> come from?
>
>
>
> Thank you very much,
>
>
>
>
> - Kurt
>
>
>
>
>
> *********
>
> Kurt Leinenweber
>
> Dept. of Chemistry and Biochemistry
>
> Arizona State University
>
> Tempe, AZ 85287-1604
>
>
>
> phone (480)-965-8853
>
> fax (480)-965-2747
>
>
>
> ***********
