Leonid
I don't know why we have such a large difference, but for some reason we
do. I will send you privately the two diagrams.
Mike

-----Original Message-----
From: Leonid Solovyov [mailto:[EMAIL PROTECTED] 
Sent: 19 February 2008 03:56
To: rietveld_l@ill.fr
Subject: RE: advice on new powder diffractometer

Dear Mike,

Normally, changing sollers must not influence the signal/background
ratio. Wider sollers, however, make the primary beam wider and if the
sample diameter is small then a parasitic scattering from the sample
holder edges may appear.

I am really surprised that moving from 0.04 Soller slits to 0.02 you got
25 times intensity reduction. When I change the primary soller from
0.04 to 0.02 the intensity drops ~2 times, so if you changed both the
primary and the secondary sollers the intensity should decrease ~4
times, but not 25 times.

Leonid Solovyov

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