The [1 + 1] two-photon dissociation spectra of CO2+X2Î g(Ω=3/2) via A2Î u,3/2 (Ï 1Ï 20) ← X2Î g,3/2(0 0 0) transitions

The mass-resolved [1 + 1] two-photon dissociation spectra of CO2+X2Πg(Ω=3/2) via A2Πu,3/2(υ1υ20) ← X2Πg,3/2(0 0 0) transitions were studied by introducing a dissociation laser with a wavelength of 283-353 nm. CO2+X2Πg,3/2(000) was prepared by the [3 + 1] multiphoton ionization of CO2 at 333.69 nm. The vibronic bands of (υ120; υ1 = 0-5)μ2Π3/2 and (υ120; υ1 = 0-5)κ2Π3/2 involving the bending mode of CO2+A2Πu,3/2 were assigned. Based on the assignments, the spectral constants of Te = 27 969.3 ± 1.2 cm−1 [above CO2+X2Πg,3/2], ν1 = 1125.89 ± 0.53 cm−1, χ11 = −0.659 ± 0.010 cm−1, ν2(μ2Π3/2) = 429.5 ± 9.7 cm−1, and ν2(κ2Π3/2) = 528.7 ± 8.0 cm−1 for CO2+A2Πu,3/2 were deduced. The photodissociation dynamics of CO2+ via A2Πu,3/2(υ1υ20) ← X2Πg,3/2(0 0 0) transitions are discussed.