Abstract
A theory of stimulated nuclear polarization (SNP) in weak magnetic fields has been advanced. An analytic expression providing the calculation of the SNP spectrum has been derived for the radical pair (RP) having one magnetic nucleus with spin I= 1 2 . It is shown that in weak magnetic fields, in contrast to strong magnetic fields, additional spectral lines appear. It is concluded that SNP, generated at high and low power of mw pumping, is due to different types of singlet-triplet transitions. A qualitative interpretation of the spectra is given. The two-quantum resonance caused by the absorption of one quantum by each of the pair's radicals is predicted. As an illustration, the calculated and experimental data on SNP in photolysis of chinones are compared.
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