Summary: Bruker EPR Procedure
Jerry Hu (Lab Manager), ext. 7914 or 7940
Jaya Nolt (Lab Tech), ext. 4997
Materials Research Laboratory
University of California, Santa Barbara
· Sample Tubes:
a.) Standard EPR tube size = 4mm OD, however, sizes do vary (2mm,
3mm, 5mm, 10mm) and can be accommodated by the instrument.
(4mm and 5mm OD are the ONLY sizes for cryogenic experiments)
b.) EPR tubes are made out of quartz whereas NMR tubes are made out of
Pyrex, which contains some iron that may or may not, depending on
your sample, contribute to the EPR signal.
c.) LOW CONCENTRATION SAMPLES:
Suprasil (synthetic) quartz tubes should be used over clear-fused
(natural) quartz b/c Suprasil will not have contributing background
signals due to e- holes (E' Signals) in the quartz (SiO2) matrix.
The E' signal is very weak and should not be a factor if there is a