----- Original Message -----
Sent: Thursday, March 04, 2004 6:21 PM
Subject: Re: checking diffractometer in
capillary mode
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----- Original Message -----
Sent: Thursday, March 04, 2004 5:03
PM
Subject: checking diffractometer in
capillary mode
Dear All,
I wonder which is the best way to check the
performances of our lab diffractometer, working in capillary (transmission)
mode. Our machine is a Bruker Vario with primary Ge monochromator
and PSD detector. As a reference sample I prepared a 0.4 mm capillary
carefully filled with SRM 676 alumina, and I use just this to check the zero
and the intensity response of the instrument before the data collections.
Moreover I periodically (3-4 months) perform an overnight scan up to 120Â to
get the instrumental profile coefficients to be subsequently used in my GSAS
refinements.
What is your opinion on this
topic?
I would be moreover (very) interested
in comparing scans of the SRM 676, made in the same experimental
conditions, taken on instruments similar to ours, so to have an idea
of our "absolute" intensities and FWHMs. Anybody
interested?
Best
regards Natale Perchiazzi
Dipartimento di Scienze della
Terra
Università di Pisa
via S.Maria 53
56126 Pisa,
Italia
