1- I have noticed some resolution decrease when using a Peltier-
cooled solid state detector instead of a proportional counter +
a graphite back monochromator (Bragg-Brentano diffractometer).
The observation applies only for samples with high fluorescency.
No difference was detected with samples like Al2O3 or LaB6
(standards from NIST). However, the conclusion is dubious as
coming from a few patterns proposed by manufacturers.
Any opinion welcome (preferably provide data from both
diffractometer configurations, operating with same fluorescent
sample and same slit systems).
2- The combination of an incident beam monochromator + a Peltier-
cooled solid state detector is claimed to be the current best
choice for a Bragg-Brentano powder diffratometer (eliminating
K-alpha-2 and avoiding fluorescency). Nevertheless, it is hard
to find data recorded with such an instrument (CuK-alpha-1) for
samples containing non negligible amount of, say, V or Cr or
Mn or Fe atoms...
Has somebody such data available (another measurement with the
same system of slits and a more conventional diffractometer
(back graphite monochromator + proportional counter) would help
for comparison) ?
Thanks in advance,
Armel Le Bail - Laboratoire des Fluorures - Universite du Maine
Avenue O. Messiaen - 72085 Le Mans Cedex 9 - France
http://fluo.univ-lemans.fr:8001/