Hiya
all
I have a bit of a
brainache for a Monday morning.
We ran a couple of
samples on a Scintag Bragg-Brentano diffractometer and found some weak
reflections that would correspond to a doubled c-axis supercell. I
was a bit wary, so I ran it on our twin mirror D8 this weekend - and found
nothing.
The Scintag recently
had a new tube and realignment so the data shouldn't be too iffy. BTW not
all samples show these weak reflections on the Scintag, so I don't think that it
is a instrument problem.
Is there any
particular reason why para-focussing might find something that a
parallel-beam would miss? I suppose the sampling volume is larger.
I'm tempted to run a capillary experiment in transmission to see if this is a
factor.
Any
thoughts?
Pam
P.S. I can't
really give much information about the sample itself as it's someone elses'
project.
Dr Pamela Whitfield CChem MRSC
Energy Materials Group
Institute for Chemical Process and Environmental Technology
Building M12
National Research Council Canada
1200
Montreal Road
Ottawa ON K1A
0R6
CANADA
Tel: (613) 998 8462 Fax:
(613) 991 2384
Email:
<mailto:[EMAIL PROTECTED]>
ICPET WWW: http://icpet-itpce.nrc-cnrc.gc.ca
