| Abstract
| - The CIDNP effects observed in photolytic reactions of(2,4,6-trimethylbenzoyl)diphenylphosphine oxide(TMBDPO) and benzoylphosphonic acid dimethyl ester (BDMP) in organicsolvents of different viscositiesare determined by S−T- transitions that occur in theregion of energy levels crossing. An analyticalexpressionis proposed for calculation of the CIDNP effects at weak magneticfields, which takes into account the S−T-transitions due to energy levels crossing. The experimental dataare compared to the results obtained by thenumerical solution of the stochastic Liouville equation (SLE) for amicroreactor model. The parameters thataffect the efficiency of the S−T- transitions arediscussed.
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