The [1 + 1] two-photon dissociation spectra of [formula omitted] via A 2Π u,3/2 ( υ1υ20) ← X 2Π g,3/2(0 0 0) transitions

Abstract

The mass-resolved [1 + 1] two-photon dissociation spectra of CO 2 + X 2 Π g ( Ω = 3 / 2 ) via A 2Π u,3/2( υ 1 υ 20) ← X 2Π g,3/2(0 0 0) transitions were studied by introducing a dissociation laser with a wavelength of 283–353 nm. CO 2 + X 2 Π g , 3 / 2 ( 0 0 0 ) was prepared by the [3 + 1] multiphoton ionization of CO 2 at 333.69 nm. The vibronic bands of ( υ 120; υ 1 = 0–5)μ 2Π 3/2 and ( υ 120; υ 1 = 0–5)κ 2Π 3/2 involving the bending mode of CO 2 + A 2 Π u , 3 / 2 were assigned. Based on the assignments, the spectral constants of T e = 27 969.3 ± 1.2 cm −1 [above CO 2 + X 2 Π g , 3 / 2 ], ν 1 = 1125.89 ± 0.53 cm −1, χ 11 = −0.659 ± 0.010 cm −1, ν 2(μ 2Π 3/2) = 429.5 ± 9.7 cm −1, and ν 2(κ 2Π 3/2) = 528.7 ± 8.0 cm −1 for CO 2 + A 2 Π u , 3 / 2 were deduced. The photodissociation dynamics of CO 2 + via A 2Π u,3/2( υ 1 υ 20) ← X 2Π g,3/2(0 0 0) transitions are discussed.