PHOTOINDUCED CHANGES IN THE FUNDAMENTAL ABSORPTION OF C-60 FILMS

An increase in the absorption in C-60 films near the optical transitio ns with 1.6 and 2.3 eV, which are forbidden in the C-60 molecule, has been observed upon photoinjection of electron-hole pairs. A long-wave shift of the allowed transition with 3.5 eV has been observed under th e same conditions. The photoinduced changes are explained in a model o f hybridized electron states with the help of results found on the tem perature dependence of the fundamental absorption of this fullerite. ( C) 1994 American Institute of Physics.