Resonance Spectrometry (EPR) allows the analysis
of paramagnetic samples, that means species with unpaired
Resonance Spectrometry (EPR) allows the
identification and characterisation of species with a
variable number of unpaired electrons and provides information about
the electronic structure of the paramagnetic species and the neighbour
nucleus, as long as the nuclear spin is different from zero and the nature
of the fundamental electronic state makes it possible.
for analysis must be in the liquid phase or solid phase. The solid phase
generally requires magnetic dilution, unless the sample paramagnetic species
is naturally diluted.
The solutions must be preferentially prepared
of low dielectric coefficient and previously air
degassed to avoid contamination with molecular oxygen. The concentration of
sample that is needed depends on the nature of the species of
interest, and typically is from 10-3 to 10-5 M.
Specific information can be obtained in several
websites dedicated to EPR experiments or directly with us.
sample volume used for X-band is about 5 ml and the samples are analysed in
(3mm of diameter and 140 mm length). The nature of the solvent may require
the use of tubes of smaller volume. For the Q-band the samples are analysed
in capillary tube