INVESTIGATION OF SPIN-LATTICE RELAXATION IN THE PHOTOEXCITED TRIPLET-STATES OF FULLERENE CRYSTAL C-60

The spin-lattice relaxation (SLR) of photoexcited triplet states in fu llerene C-60 crystal is investigated at low temperatures and high magn etic fields. The mixing of translational motions of the molecule and v ibrational motions of the nuclei (TVM relaxation mechanism) is chosen as the major phenomenon, leading to the coupling of spin system with a coustic vibrations. The general expressions of SLR rates for the direc t one-phonon processes are obtained using the atom-atom potentials and ab initio molecular orbitals (MO) methods. The influence of dynamic J ahn-Teller (JT) effect in a molecule C-60 on the SLR rates is analyzed . A comparison of calculated values for SLR time with available experi mental data is carried out.