Abstract
A quantitative test of ENDOR theory for free radicals in solution is performed on the 14N nucleus of the nitrobenzene radical anion in dimethoxyethane. Dominant relaxation contributions are caused by modulation of the electron nuclear dipolar interaction. They can be calculated from the known G and 14N hyperfine tensors of the nitrobenzene radical anion. The effects of spin-rotation interaction and Heisenberg spin exchange at different concentrations are investigated experimentally and theoretically. The concentration and temperature dependences of the 14N ENDOR amplitudes are found to agree well with theoretical predictions.
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