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 micromec hanism of reverse saturable absorption of C-60 molecule were studied b y using INDO/CI method, A dynamic model has been used for reserving ra te equations, It is concluded that the necessary condition of reverse saturable absorption is the absorption cross section of exited state m ust be larger than that of ground state for LASER. This condition is s atisfied when the wavelength pf incident LASER is equal to 532 nm for C-60, so the character of reverse saturable absorption appears.