OPTICAL STUDIES OF FULLERENE-BASED SOLIDS

Results of optical studies on oxygen-doped, alkali-metal(M)-doped and photopolymerized solid C60 films are reported. Results of Raman scatte ring studies of MxC60 films are presented, but discussion is focused o n recent Raman scattering studies of superconducting Rb3C60 films (T(c ) almost-equal-to 28 K) from T = 300 to 9 K. The effects of the exposu re of C60 to light and/or oxygen are also presented. If pristine C60 i s exposed at T = 300 K to visible or UV light, a photoinduced polymeri zation of the structure is obtained, which is consistent with results from laser desorption mass spectroscopy and optical spectroscopy. If o xygen is also present, the photoinduced polymerization is suppressed, and the oxygen is observed to diffuse about 2000 angstrom in about 1 h , eventually leading to oxidation of the structure.