Dear Spinlanders,
I am running samples in 3mm Wilmad tubes in d2o on a 500 MHz Varian cold
probe. I can get beautiful line shape and z-gradient maps with the
standard 3mm doped d2o sample. When I tried to do gradient shimming on
actual samples, I noticed that I always need to readjust Z1 (usually by
increasing Z1) to get better line shape. Both the standard doped d2o
sample and my experimental samples are at room temperature and thus I don't
think I have a temperature gradient problem - or do I. Can someone point
out what is going on. Your help is much appreciated.
Sincerely,
Que Van
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Que N. Van
[Contractor]
Laboratory of Proteomics and Analytical
Technologies
National Cancer Institute
SAIC-Frederick, Inc. [Contractor]
PO BOX B
Frederick, MD 21702
office: 301-846-7192
fax : 301-846-6037
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Received on Tue Dec 06 2005 - 10:22:35 MST