Abstract
The kinetics of the nuclear polarization formed during the photolysis of acetone in isopropanol- d 8 were analyzed quantitatively. Model calculations show that the spin-selective recombination of radicals gives rise to the electron polarization and, with regard to the electron-nuclear cross-relaxation, are adequate to describe the formation of the net nuclear polarization of the reaction products even if the solution contains only one type of radical. For the 2-hydroxy-2-propyl radicals at a magnetic field of 7 T, fitting the theoretical results to the experimental data gives the electron relaxation time T 1 e = 1.0 ± 0.2 μs and the cross-relaxation time T x = 92 ± 18 μs.
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