THE EXCITED-STATES SPECTRA (S-1-]S-N, T-1-]T-N) AND REVERSE SATURABLE ABSORPTION OF C-60

The electronic structure, ground and excited-states spectra (S-0-->S-n, S-1-->S-n, T-1-->T-n), excited-state molecular dynamics and micromechanism of reverse saturable absorption of C-60 molecule were studied by using INDO/CI method, A dynamic model has been used for reserving rate equations, It is concluded that the necessary condition of reverse saturable absorption is the absorption cross section of exited state must be larger than that of ground state for LASER. This condition is satisfied when the wavelength pf incident LASER is equal to 532 nm for C-60, so the character of reverse saturable absorption appears.