Field-swept and frequency-swept E.P.R. copper spectra

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Abstract
A theoretical model for E.P.R. spectra simulation of Cu2+-complexes in frozen aqueous solutions is presented. By assuming a gaussian distribution of the g ‖ and A ‖ spin-hamiltonian parameters, the method takes very satisfactory account of both the increase in linewidth of the hyperfine lines in order of increasing m 1 and of the unequal spacing between these lines observed in experimental spectra that arises from strain effects during freezing. The model is expressed in a formalism derived from the frequency-swept domain and translated, for E.P.R. spectra synthesis, into the field-swept domain.