The multiphoton dissociation and ionization of CS2 in the range 242-260nm

The mass-selected excitation spectra for parent ion CS2+ and the fragmentation ions CS+, S+ and C+ are obtained by using the resonance-enhanced multiphoton ionization (REMPI) of CS2 in the range 242-260nm. It is shown that the diffuse bands of CS2+ in range of lambda <246.4nm are mainly from the two-photon ionization of CS2. It has been reasonably assumed from the assignments of excitation spectra for the fragments that the neutral CS and S are produced by the photodissociation of CS3 in the process, that is, (1) the bands of CS+ are mainly due to the (1+1) resonance-enhanced ionization via the one-photon transition A(1)Pi <-- X(1)Sigma(+)(upsilon " less than or equal to 2) of the fragment CS, (2) besides part of S+ spectral peaks are from the dissociation of CS+, most of S+ spectral peaks are due to the (2+1) resonance-enhanced ionization via, the two-photon transition 3p(3) (D-2(0)) 4p, 3p(3) (S-4(0)) np (n=6,7,8) <-- 3p(4) P-3(J) (J=2,1,0) of S atoms.