Main INDEX
Monthly INDEX
PREV
NEXT
User name kelleher
Log entry time 11:34:59 on March 7,2006
Entry number 165621
This entry is a followup to: 165262
keyword=EPR signal update
Starting last weekend there were stange EPR signals that indicated that the field of the magnet had been drifitng by up to 2G. This "drift" seemed to be occurring after an NMR measurement.
We can now say with increasing certainty that it is not the case that the magnetic field is drifting after NMR measurements. What has been reported as a shifted, poor quality, EPR signal is more than likely a different resonance, not the main potassium resonance that we thought we had been seeing.
A careful reanalysis of these signals with our new understanding is underway, but the preliminary result is that we did see increasing ploarizaiton, and we did not see a large shift in magnetic field. The field seems to be fairly stable at 25G.
The main points are that our field is not shifting, we can extract useful polarization information from the measurements that we made, and that we know what to look for to avoid this mistake in the future.