R. Nakagaki et al., MAGNETIC-FIELD EFFECTS ON END-PRODUCT YIELDS OBSERVED FOR PHOTOCHEMISTRY INVOLVING BIRADICAL INTERMEDIATES, Chemical physics letters, 244(5-6), 1995, pp. 388-394
Magnetic field effects upon product yields are detectable for photored
ox reactions of the chain molecules (4-nitrophenoxyl)-(methylene space
r)-(reductant) when the intersystem crossing rate between the singlet
and triplet biradicals depends upon the magnetic field and the escape
process involving the biradical intermediates and the starting species
is relatively efficient. The magnitude of the magnetic field effects
can be determined by the competition between the spin-lattice relaxati
on and the bimolecular escape process.