A new method is presented to observe radiofrequency transitions between ligand hyperfinestructure levels. Contrary to conventional Endor no microwave field is required, the role of the microwave transition being taken over by cross relaxation processes. Mechanism and results of this “Endor without microwaves” are discussed in detail for the system CaF2:Tm2+. The analysis of the signals reveals details of the dynamics of the spin system.
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Dieckmann et al. (1983) studied this question.
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