Abstract
Absolute net nuclear polarizations are determined for the products of geminate radical pairs formed after triplet cleavage of ditert-butyl ketone in four different solvents as functions of temperature. A correlation with the diffusion coefficients of the radicals shows that for high temperatures/low viscosities the polarizations increase as D − 1 2 whereas for low diffusivities a levelling-off is observed. This dependence is analyzed by the high-field radical pair theory of CIDNP and yields information on the initial radical pair distance and on exchange parameters. Disproportionation to combination ratios of the radical pairs and their viscosity dependence are also reported.
Published Version
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