Thomas Taut
> Questions for powder diffractionists (conventional X-rays).
> 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/
Viele Gruesse
Thomas Taut