[sdpd] Hump ???

[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





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