Va. Andreev et Yi. Prilutsky, THEORETICAL-STUDY OF FREQUENCY-DEPENDENCE OF THE SPIN-LATTICE RELAXATION RATE IN THE TRIPLET EXCITED AA-CENTERS OF ORGANIC MOLECULAR-CRYSTALS, UKRAINSKII FIZICHESKII ZHURNAL, 38(9), 1993, pp. 1378-1383
Theoretical study of the SLR frequency dependence in the triplet excit
ed AA-pairs of organic molecular crystals has been carried out at low
temperatures. The fine structure energy modulation under the phonon tr
ansitions between the ''Davydov components'' of the spectrum is chosen
as the major mechanism leading to the SLR. The difference of the ''Da
vydov components'' fine structure is connected with the spin-orbit int
eraction effects.