A P-31-SNP STUDY OF THE PHOTOLYSIS OF (2,4,6-TRIMETHYLBENZOYL)DIPHENYLPHOSPHINE OXIDE IN MICELLES OF DIFFERENT SIZES

P-31 stimulated nuclear polarization spectra and their dependence on t ime after photolysis of (2,4,6-trimethylbenzoyl)diphenylphosphine oxid e in micellar solution of sodium octyl- (SOS) and dodecylsulfate (SDS) are investigated and discussed in terms of the numerical solution of the stochastic Liouville equation for a microreactor model. The decay of the geminate radical pair is found to be about 2.5 times slower in SDS than in the SOS micelles due to a larger re-encounter rate in the latter one, Simulation of the experimental results further suggests J( 0) approximate to -1.6 x 10(10) rad/s for the exchange interaction at contact distance, and an increasing micellar size with increasing radi cal size.