LUMINESCENCE LINE NARROWING IN THE LOW-TEMPERATURE GLASSY PHASE OF SOLID C-60

Vibrational zero-phonon lines and structured sidebands are obtained at temperatures below 40 K in C-60 films by narrow-band selective excita tion with a cw Ti:sapphire laser. The large inhomogeneous broadening ( about 130 cm(-1)) of the purely electronic transition (with a maximum at 733 nm) is explained by orientational disorder in the low-temperatu re glassy phase of solid C-60. The peaks in the sidebands can be attri buted to librational modes. The Debye-Waller factor was found to be 0. 3.