Re: [sdpd] Hump ???

[Radovan.Cerny...@cryst.unige.ch]

Hi Armel,

I had something similar, but with the primary beam monochromator and PSD from
Braun. It was a scattered radiation comming somewhere from the monochromator,
or slit system, and seen by PSD, which see everything from everywhere. A small
piece of lead did the job.

Radovan Cerny


Quoting Armel Le Bail <alb...@cristal.org>:

> 
> Hi,
> 
> Since more than one year, our powder patterns made
> on a Bruker D8 Advance show a strange and systematic
> hump in the range 18-24° 2-theta.
> 
> See a series of SRM NIST-1976 patterns :
>              http://www.cristal.org/total.jpg
> These measures were made with fixed slits 0.3/0.3 and
> 0.1 analysis slit. The hump is always there whatever
> the slits, even using variable slits, whatever the sample.
> Bragg-Brentano Cu-Kalpha, graphite monochromator
> >in the diffracted beam. Not seen in 1999 or 2002.
> 
> Have you observed that ? How to avoid it ?
> (shame on us and Bruker for not being able
> to explain and remove it... all the system
> was realigned last week by the Bruker expert
> - no explanation yet).
> 
> Armel
> 
> 
> 
> 
> 
> 
>  
> Yahoo! Groups Links
> 
> 
> 
>  
> 
> 
> 
> 






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