Collision- and non-collision-induced predissociation in the appearance of S+ and CS+ ions from CS2 under electron impact

Mode specific photodissociation of CS2+via the A2Πu state: a time-sliced velocity map imaging study

“…1. Previous studies 20,41,49,50 imply that the only repulsive state is the 4 S À satellite state, which correlates to the lowest S + channel: S + ( 4 S) + CS (X 1 S + ). Indeed, the direct transition from the A 2 P u state to the 4 S À state is spin forbidden according to the Hund's case (a).…”

Study on the Photodissociation Spectra of CS2+ via B̃2Σu+ and C̃2Σg+ Electronic States

“…Moreover, in Figure 2, no spectrum related to the transition from CS 2 + (X ˜2Π g,1/2 ) could be found; this fact can be explained, at least, by the strong population of X ˜2Π g,3/2 (0,0,0) and the weak population of X ˜2Π g,1/2 (0,0,0) in the [3 + 1] REMPI process of the CS 2 at 483.2 nm. 15 Because the energy levels of B ˜2Σ u + related to the resonance peaks in Figure 2 are all less than the first dissociation limit (4.6 eV) to produce S + and the second dissociation limit (5.852 eV) to produce CS + , 2,3,8,16,17 two photons are needed to dissociate CS 2 + (X ˜2Π g,1/2 ). It means that the dissociation process via the B ˜2Σ u + r X ˜2Π g,3/2 transition of CS 2 + to produce CS + and S + is a [1 + 1] process.…”

“…As an important species in astrophysics and atmospheric physics, 1 the spectroscopy and dissociation dynamics of the linear CS 2 + ion have been studied by a variety of experimental techniques. [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] Optical emission from the A ˜and B ˜states of CS 2 + was observed, and the vibrational frequencies and rotational constants were precisely determined from the spectra. 10,12 The dissociation dynamics from the electronically excited states of CS 2 + were also studied by mass spectroscopy, 2 electron impact technique, 3 photoelectron photoion coincidence spectroscopy, 17 and photofragment excitation spectroscopy.…”

“…[2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] Optical emission from the A ˜and B ˜states of CS 2 + was observed, and the vibrational frequencies and rotational constants were precisely determined from the spectra. 10,12 The dissociation dynamics from the electronically excited states of CS 2 + were also studied by mass spectroscopy, 2 electron impact technique, 3 photoelectron photoion coincidence spectroscopy, 17 and photofragment excitation spectroscopy. [4][5][6][7][8] The C ˜state of CS 2 + was found to be totally predissociative and correlated to the CS + and S + fragment ions.…”

Dissociative ionization of carbon disulphide in the gas phase. Heat of formation of the CS radical

“…Momigny et al [13], in an electron impact study of the metastable transitions in CS 2 , observed at 15 ± 1 eV two kinds of S + ions: one produced by a slow rate decaying metastable molecular state, with a kinetic energy release lower than 0.25 eV, the second, in the same energy range, due to a fast rate component. The authors interpreted the first as the result of the predissociation of the B 2 Σ u + by the 4 Σ -state, the second as due to the predissociation of the X 2 Π g or A 2 Π u by the same 4 Σ -state.…”