Title: SPIN-LATTICE RELAXATION IN THE PHOTOEXCITED TRIPLET STATE OF SOLID C_60: CONSIDERATION OF SPIN-ORBITAL INTERACTION
Authors: Yu.I.Prilutski (Kyiv T.Shevchenko National University, Physics Faculty, 64 Volodymyrska St., UA-252033 Kyiv, Ukraine)

The spin-lattice relaxation (SLR) mechanism based on the energy modulation of spin-orbital interaction (SOI) has been investigated in the photoexcited triplet states of a fullerene crystal C_60. This modulation emerges as a result of admixture of rotational motions of a molecule and vibrational motions of the nuclei to the translational molecular motions at the acoustic lattice vibrations. Simple expressions for SLR rates of direct one-phonon processes are obtained using the atom-atom potentials and molecular orbitals (MO) methods. The influence of the dynamic Jahn-Teller (JT) effect in a molecule C_60 on the SLR rates is analyzed. A comparison of the calculated values for SLR time with available experimental data is carried out.

Comments: Figs. 0, Refs. 30, Tabs. 1.