[3dem] NMR machines and magnetic fields.
Ron Milligan
milligan at scripps.edu
Fri Jun 5 08:27:00 PDT 2009
NMR instruments rarely cause problems for microscopes. They generate
an extremely constant magnetic field - probably more stable than the
earth's magnetic field - so they only affect EMs when they are turned
on and off (at which point realigning the beam is all that needs to be
done). The fields fall off rapidly in the horizontal direction and
more slowly in the vertical direction.
Over the years we have had a few problems with fields, but they were
never due to the NMR instruments that were right next door. Usually
the problem was due to some small lab instrument located nearby.
Ron
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