Acoustophosphorescence double resonance in impurity C-70 fullerene crystal

An acoustophosphorescent double resonance is investigated in terms of a low-temperature spin-phonon interaction mechanism determined by a coupling of translational and rotational molecular motions, Numerical values are obtained for the transition times of direct single-phonon processes in high, as well as zero, magnetic fields for a triplet excited isotopic impurity in crystalline C-70 fullerene. The dependence of the transition rate on the propagation direction of the acoustic wave is analyzed in detail. (C) 1997 American Institute of Physics.