Cross relaxation in free radicals with chemically induced electron and nuclear polarization

Abstract
Electron-nuclear cross relaxation in free radicals with chemically induced nuclear polarization (CIDNP) is discussed in the light of some unexpected chemically induced electron polarization (CIDEP) effects. Sign rules are deduced for the transfer of net CIDNP to net CIDEP and multiplet CIDNP to multiplet CIDEP. Experiments indicating that cross relaxation is not responsible for the unusual CIDEP observations are described.
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