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
> 
>  
> 
> ***********


      

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