ESR and ENDOR studies of irradiated potassium dihydrogen phosphate

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Irradiated single crystals of potassium dihydrogen phosphate were studied via ESR and ENDOR techniques in order to define phosphate group structures. A precursor cation species was produced at 4.2 K which converted upon warming to a radical previously reported for 77 K irradiation. The g values and proton ENDOR results allowed detailed models for both species to be constructed. Phosphorous ENDOR resonances were also detected and provided complete hyperfine splitting tensors for both species which reflected small internal phosphate group polarization densities.