CHARGE-INDUCED ASYMMETRIC PHONON BROADENING IN C-60

We observed photoinduced splittings of the triply degenerate infrared-active mode associated with radial motion at 527 cm-1 due to the coupling of phonons to the band excitations (electrons and holes) in C60. Furthermore, we found a remarkable temperature-dependent asymmetric linewidth broadening on the high-frequency side lobe of the 576.7-cm-1 mode with an onset at T almost-equal-to 30 K, suggesting an additional frequency-dependent damping mechanism involving the phonon-electron scattering at low temperatures.