Dear NMR Users,
When we were collecting a 1D 1H spectrum of TSP (trimethylsilyl propionate)
in D2O using a TXI probe, we noticed that the lock level experienced a
drastic fluctuation, with a period of 10-20 seconds, at an elevated
temperature (60C) when the sample tube is degassed and sealed. The higher
the temperature, the worse the lock fluctuation. This of course induces bad
line broadening of 1H signals. This fluctuation effect doesn't exist
either at room temperature with the sample tube sealed or at elevated
temperatures (e.g. 60C) with the sample tube unsealed. Have any users
noticed this type of effect ? Any solutions ?
Thanks,
Jerry Hu
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Jerry Hu, Ph.D. email: jghu_at_mrl.ucsb.edu
RD Engineer Tel: (805)893-7914
Materials Research Lab, UCSB Fax: (805)893-8502
Santa Barbara, CA 93106
Received on Fri Oct 24 2003 - 17:01:18 MST