High resolution absorption spectrum of jet-cooled CS2 between 65 000 and 71 000 cm−1: Assignment of bent …5σu3πu and linear …2πg3 3d and 5s gerade states

The absorption spectrum of jet-cooled CS2 was photographed between 65 000 and 71 000 cm−1 at a resolution limit of 0.0008 nm. In the first half of the energy interval considered, a bending vibrational progression is assigned corresponding to the transition between the linear ground state and a bent excited state …6b29a11B2 correlating with the …5σu3πu1Πg state of the linear molecule. The same progression is observed in the (3+1) resonance enhanced ionization (REMPI) spectrum of Baker and Couris [J. Chem. Phys. 103, 4847 (1995); 104, 6130 (1996); 105, 62 (1996)]. Another observed bending progression in the [(1+1)+1] REMPI spectrum for the same region is here assigned to the other, less bent state …6b23b11A2 issuing from the …5σu3πu1Πg linear state. In both progressions, Δv1=1 transitions are also observed. In the upper half of the energy range considered, the absorption spectrum consists essentially of 210, 201, and 203 bands associated with excitation of …2πg3 3d and 5s 1Πg states. The corresponding origi...