Abstract
The CIDNP effects observed in photolytic reactions of (2,4,6-trimethylbenzoyl)diphenylphosphine oxide (TMBDPO) and benzoylphosphonic acid dimethyl ester (BDMP) in organic solvents of different viscosities are determined by S−T- transitions that occur in the region of energy levels crossing. An analytical expression is proposed for calculation of the CIDNP effects at weak magnetic fields, which takes into account the S−T- transitions due to energy levels crossing. The experimental data are compared to the results obtained by the numerical solution of the stochastic Liouville equation (SLE) for a microreactor model. The parameters that affect the efficiency of the S−T- transitions are discussed.
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