Abstract
THE method of double electron–electron resonance (EDR) involves measurement of changes in the intensities of ESR lines, when one of them is saturated with microwave power. Similar phenomena (cross saturation) were observed previously (see refs. 1–3 and an unpublished paper by J. Hyde given at the Eighth International Symposium on Free Radicals, 1967). Bloembergen et al.4 explained this effect as a result of double transitions between different Zeeman levels in the absence of spin-lattice interactions. EDR is therefore a direct method for measurement of paramagnetic centre interactions. The simplest system in which EDR can be observed is that with three non-equidistant levels, for example, triplet centres with zero-field splitting.
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BENDERSKII, V., BLUMENFELD, L., STUNZAS, P. et al. Double Electron–Electron Resonance of Triplet Excitons in Ion-radical Salts. Nature 220, 365–367 (1968). https://doi.org/10.1038/220365a0
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DOI: https://doi.org/10.1038/220365a0
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