Theory of geminate recombination of radical pairs with instantaneously changing spin Hamiltonian. IV. Stimulated polarization of nuclei in switched external magnetic field

Electron-nuclear spin transitions in free phosphonyl radicals detected via CIDNP

“…This leads to some special spectral features due to the effect of the rf field on nuclear polarization of diamagnetic reaction products. As ir has been shown by Osintsev et al [7], additional lines missing in strong fields appear in the SNP spectrum in weak magnetic fields. Ah rf field with a high amplitude gives rise to multiquantum resonances in SNP spectra [8,9].…”

Dynamic and stimulated nuclear polarisation in photochemical radical reactions

“…Osintsev et al 84 used the kinematic approach to derive the analytical expressions for calculating the SNP effects of radical pairs with one HFC constant in arbitrary magnetic fields. In another study, 73 these reseachers analysed the line profile in the SNP spectra in weak magnetic fields, comparable with the HFC constant, for different RF-field amplitudes.…”

“…Apparently, the spectrum corresponds to the [Ph Ph] and [Ph CD 2 OD] pairs. Osintsev et al 84 have considered theoretically the problem of the line shape in the SNP spectra recorded in time-resolved experiments and the dependence of SNP on the character of motion of the partners of radical pairs. From the theoretical standpoint, consideration of these processes is reduced to the calculation of the probability of recombination of geminate radical pairs.…”

Theoretical and experimental studies of CIDNP kinetics in recombination of radical pairs by the method of switched external magnetic field. I. Theory

“…Later, it was used in a number of ways in theoretical calculations of magnetic and spin effects. [14][15][16][17][18]24 The essence of this approximation is the uncoupling of corresponding mean values over the reaction zone, the zone of the exchange interaction and the zone of level crossing. These mean values result from the averaging for the kinetic equation for the density matrix of RP written in terms of Green's function.…”

“…The SNP theory in switched external field has been formulated in Ref. 16. The authors showed a high sensitivity of spectral line intensity and shape to the character of the relative motion of radicals in the pair.…”