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

Momigny, J.; Mathieu, G.; Wankenne, H.; Ferreira, M. A. Almoster

doi:10.1016/0009-2614(73)80320-3

Cited by 24 publications

(22 citation statements)

References 14 publications

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“…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).…”

Section: Discussionmentioning

confidence: 87%

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

Zhang

et al. 2012

Phys. Chem. Chem. Phys.

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The vibrationally mediated photodissociation of CS(2)(+) cations via the A(2)Π(u)(ν(1),ν(2),0) state has been studied by means of the velocity map ion imaging technique. The measurements were made with a double resonance strategy. The CS(2)(+) cations were prepared by a (3 + 1) resonance enhanced multiphoton ionization method. The photo-fragment excitation spectrum of S(+) was recorded by scanning the photolysis laser via the A(2)Π(u)(ν(1),ν(2),0) state. By fixing the photolysis laser wavelength at the specific vibrational state, the (1 + 1) photodissociation images of S(+) photofragments from numerous vibrationally mediated states have been accumulated. The translational energy release spectra derived from the resulting images imply that the co-fragments, CS radicals, are both vibrationally and rotationally excited. The one-photon photodissociation without the vibrational state selection has also been performed. Comparing the vibrationally mediated photodissociation with one-photon photodissociation observations, clear evidence of vibrational state control of the photodissociation process is observed.

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Section: Discussionmentioning

confidence: 87%

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

Zhang

et al. 2012

Phys. Chem. Chem. Phys.

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“…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.…”

Section: Resultsmentioning

confidence: 99%

“…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.…”

Section: Introductionmentioning

confidence: 99%

“…[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.…”

Section: Introductionmentioning

confidence: 99%

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Study on the Photodissociation Spectra of CS₂⁺ via B̃²Σ_u⁺ and C̃²Σ_g⁺ Electronic States

et al. 2006

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The photodissociation spectra of CS(2)(+) ions via B(2)Sigma(u)(+) and C(2)Sigma(g)(+) electronic states have been studied by using two-photon excitation, where the parent CS(2)(+) ions were prepared by [3 + 1] REMPI (resonance-enhanced multiphoton ionization) at 483.2 nm from the jet-cooled CS(2) molecules. The [1 + 1] photodissociation spectrum of CS(2)(+) via the B(2)Sigma(u)(+)(upsilon(1)upsilon(2)0) <-- X(2)Pi(g,3/2)(000) transition was obtained by scanning the dissociation laser in the wavelength range of 270-285 nm and detecting the signal of both S(+) and CS(+). The [1 + 1'] photodissociation spectra of CS(2)(+) were obtained by fixing the first dissociation laser at 281.94 or 277.15 nm to excite the B(2)Sigma(u)(+) (000 or 100) <-- X(2)Pi(g,3/2)(000) transitions and scanning the second dissociation laser in the range of 606-763 nm to excite C(2)Sigma(g)(+)(upsilon(1)upsilon(2)0) <-- B(2)Sigma(u)(+)(000,100) transitions. New spectroscopic constants of nu(1) = 666.2 +/- 2.5 cm(-1), nu(2) = 363.2 +/- 1.9 cm(-1), chi(11) = -5.5 +/- 0.1 cm(-1), chi(22) = 1.6 +/- 0.1 cm(-1), chi(12) = -8.6 +/- 0.2 cm(-1), and k(122) = 44.9 +/- 2.5 cm(-1) (Fermi resonance constant) for the C(2)Sigma(g)(+) state are deduced from the [1 + 1'] photodissociation spectra. On the basis of the [1 + 1] and [1 + 1'] photodissociation spectra, the wavelength and level dependence of the product branching ratios CS(+)/S(+) has been found and the dissociation dynamics of CS(2)(+) ions via B(2)Sigma(u)(+) and C(2)Sigma(g)(+) electronic states are discussed.

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“…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.…”

Section: S + Formationmentioning

confidence: 99%

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

Hubin‐Franskin

Locht

Katihabwa

1976

Chemical Physics Letters

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Measurements of the appearance potentials and the kinetic energies of S + and CS + ions formed by electron impact on carbon disulphide in the gas phase lead us to propose a value as low as 34 ± 6 kcal mole -1 for the heat of formation of the CS radical in its ground electronic state. It is also shown that the predissociations of the A 2 Π u /or X 2 Π g and the B 2 Σ u molecular ion states by a repulsive 4 Σ -state giving rise to S + ions, observed through metastable ions study, occur at 13.45 eV and 14.55 eV respectively.

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

Cited by 24 publications

References 14 publications

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

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

Study on the Photodissociation Spectra of CS₂⁺ via B̃²Σ_u⁺ and C̃²Σ_g⁺ Electronic States

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

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

Cited by 24 publications

References 14 publications

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

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

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

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

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Study on the Photodissociation Spectra of CS₂⁺ via B̃²Σ_u⁺ and C̃²Σ_g⁺ Electronic States