Light-excited C_(60) is studied by electron-lattice coupling tight-binding model. When one or two electrons are excited from HOMO to LUMO, the lowest energy state is ring bipolaron with the following characteristics: (1) The bond structure is layers with seven different bonds. In comparison with the dimerized state, bond variation is like that of ring polaron: to be the largest in equator, nearly unchanged in poles. (2) Two energy levels get into the gap and form the self-trapping electronic bound states which localize in the equator area. (3) C_(60)'s symmetry reduces from I_h to D_(5d). (4) There exist nonlifiear exciton and 4 NMR lines.
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傅柔励 傅荣堂 等.光激发下的C60[J].红外与毫米波学报,1993,12(1):81~88]. Fu Rouli, Ye Hongjuan. C_(60) EXCITED BY LIGHT[J]. J. Infrared Millim. Waves,1993,12(1):81~88.]