Hi all,

Does the error maximize at 2-theta = 90 then decrease again?  Back when
I was an actual crystallographer and used an INEL system, this was
observed when the capillary position was not coaxial with the detector
(in fact, when it was behind the proper position).

Alex Y

________________________________________
Dr. Alexandre (Alex) F. T. Yokochi
Assistant Professor
Department of Chemical Engineering
Oregon State University
Corvallis, OR 97331-2702

Voice:  (541) 737-9357
Fax:  (541) 737-4600
http://oregonstate.edu/~yokochia

> -----Original Message-----
> > *From:* Kurt Leinenweber [mailto:ku...@asu.edu]
> > *Sent:* Thursday, January 08, 2009 6:09 PM
> > *To:* Rietveld_l@ill.fr
> > *Subject:* error in peak positions that is linear in theta
> >
> >
> >
> > Dear Rietvelders,
> >
> >
> >
> > (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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