UW CHEMISTRY NMR

Hello all

You might have noticed that the NMR Lab i.e. Rm.37, Bagley was ‘generously warm’  today and in fact the thermostat was reading close to 86 F.  Over and above this high room temperature, we discovered that the control mechanism that keeps the room temperature from fluctuating wildly, is not functioning.

The upshot: The chiller of AV500 in close proximity to the room radiators is struggling to do its job.  In general the shim stacks of all the magnets will suffer due to this instability.

What you can expect:  The concerned people have been alerted and I was told that the situation will improve in the next day or two.   Until this time, the shim quality and stability will be less than ideal.  If you get pretty poor lineshape (despite Topshim telling you it converged), you can follow the protocol below before recording the spectrum :

• Insert the decoy sample
• Lock on “h2o+d2o” lock solvent.
• Type on command line “topshim 3d”. Wait till it completes (about 5 to 7 min. max)
• Now, insert your sample, lock it and do “topshim 1d”.

Based on the ‘ground situation’,  I guess AV500 will be the most affected as of now.  Thank you for your kind understanding and cooperation.

NMR Facility Manager

10/29/20