Saturday, November 25, 2006

Spinning side band spectrometry

It is very frustrating when machines are down. Sometimes you can see perfomance decline over a period, and it has to be really bad before it is fixed.

We had a problem with our NMR this week. The magnetic field homogeneity got worse within a few days resulting in the same spectrum for all our compounds : 9-0 ppm, multiplet, all H's. One TMS peak became three, and after a week we couldn't count the number of TMS peaks anymore.
We are so lucky it got so bad. The manufacturer came yesterday and fixed the problem after a day kicking the magnets and a few hours of shimming.

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