Molecular dynamics mass spectrometric study of the collision-induced dissociation of CS2+ ions at low and intermediate collision energies

Shukla, Anil; Tosh, R; Chen, Y.B.

doi:10.1016/0168-1176(95)04194-p

Cited by 14 publications

(10 citation statements)

References 27 publications

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“…(31) A reviewer expressed a similar expectation, implying that the absence of backward-scattered CS2"1" is consistent with excitation sufficient to dissociate the molecule. In fact, the work presented here and in ref 23 shows that dissociation fragments are found almost exclusively in the forward hemisphere for CS2+/Ar collisions at this energy. However, recently we have undertaken a more thorough search for C$2+ in the backward hemisphere, and our preliminary findings at 8.9 eV CM collision energy show evidence for excitation to the A and B electronic states amounting to a few percent of the elastically scattered signal.…”

Section: Application Of Model To S+ Formationsupporting

confidence: 57%

Elaboration of an Impulsive Model for Collision-Induced Dissociation: Application to CS2+ + Ar .fwdarw. S+ + CS + Ar

Tosh¹,

Shukla²

1995

J. Phys. Chem.

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The crossed-beam method provides uniquely valuable information for deducing details of energy transfer, reaction mechanisms, and broad features of energy disposal in chemical reactions. This crossed-beam study of the dynamics of elastic scattering of CS2+ and the lowest energy dissociation channel CS2+(X2rI,) -S+(4S,) + C S ( X P ) on collision with argon at 17.8 eV collision energy provided the impetus for developing a "knockout" model for collision-induced dissociation. The occurrence of a ridge of intensity of S+ originating within and extending outside the elastic scattering circle is quantitatively rationalized by this model. Symmetry of the scattering ridge about a point on the relative velocity vector and the radius of the ridge which connects maxima in relative intensity ranging from zero scattering angle to 44" (LAB) are quantitatively connected by the model to the bond dissociation energy of CS2+. The model requires that the potential curve describing the interaction of S+ and CS be essentially "flat" when the momentum exchange collision with Ar occurs.Consequently, we infer that transfer of kinetic energy into internal energy of CS2+ equal to its bond dissociation energy occurs in the approach trajectory. It is suggested that this involves the electronic excitation CS2+-(X'rI,) -CS2+(B2c).

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Section: Application Of Model To S+ Formationsupporting

confidence: 57%

Elaboration of an Impulsive Model for Collision-Induced Dissociation: Application to CS2+ + Ar .fwdarw. S+ + CS + Ar

Tosh¹,

Shukla²

1995

J. Phys. Chem.

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“…Table indicates that the CS 2 •+ ions are less stable with respect to fragmentation. Thus, incoming CS 2 •+ ions may be more likely to undergo CID reactions such as These reactions have been extensively studied by Futrell and co-workers . Prinslow and Armentrout show that, at low collision energies, pathway 2 is the dominant CID pathway.…”

Section: Resultsmentioning

confidence: 99%

Matrix Isolation and Cold Diffusion of Mass-Selected CS₂^•+ in Neon: Infrared Observation of the Asymmetric Stretch of CS₂^•+ and CS₂^•-

et al. 1996

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Vibrational spectroscopic characterization of neon matrices in which mass-selected CS2 •+ and CS•+ were deposited reveals absorptions due to (ν3) CS2 •+ (1207.1 cm-1) and (ν3) CS2 •- (1159.4 cm-1). The results are compared to previous CO2 •+ studies from this laboratory [Godbout et al. J. Phys. Chem. 1996, 100, 2892]. We also report controlled annealing studies of the matrices in which clustering of ionic species with neutral molecules is observed.

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“…[8][9][10][11][12][13][14][15][16][17][18][19][20] Optical emissions from the Ã 2 ⌸ u and B 2 ⌺ u ϩ states of CS 2 ϩ were observed and vibrational frequencies and rotational constants were precisely determined from the spectra. 8,9 The structure of this molecular ion in the ground and low lying electronic states was found to be linear.…”

Section: Introductionmentioning

confidence: 99%

State-selected photodissociation dynamics of CS2+ in the C̃ 2Σg+ state

Hwang

Kim

2000

The Journal of Chemical Physics

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Articles you may be interested inDissociation of internal energy-selected methyl bromide ion revealed from threshold photoelectron-photoion coincidence velocity imaging J. Chem. Phys. 140, 044312 (2014); 10.1063/1.4862686Photodissociation mechanisms of the CO2 2+ dication studied using multi-state multiconfiguration second-order perturbation theory [1 + 1] photodissociation of CS 2 + ( X ̃ 2 Π g ) via the vibrationally mediated B ̃ 2 Σ u + state: Multichannels exhibiting and mode specific dynamics J. Chem. Phys. 134, 114309 (2011); 10.1063/1.3567071 Unimolecular decay pathways of state-selected CO 2 + in the internal energy range of 5.2-6.2 eV: An experimental and theoretical study State-selected photodissociation dynamics of CS 2 ϩ molecular ion has been investigated by an optical-optical double resonance technique. The CS 2 ϩ molecular ions were prepared by ͓2ϩ1͔ REMPI and the predissociative C 2 ⌺ g ϩ state was populated by the B 2 ⌺ u ϩ ←X 2 ⌸ g,3/2 followed byThe product branching ratios, CS ϩ /S ϩ , for selected vibrational levels in the C state and average kinetic energy releases in the CS ϩ and S ϩ production channels were measured from the time-of-flight mass spectra. It has been found that excitation of the bending vibration enhances the CS ϩ production channel more than the S ϩ channel. In addition, an isotropic fragment distribution for different polarizations of the dissociating laser light has been observed, from which the dissociation time was estimated to be longer than 20 ps. Dynamical aspect of the reaction revealed by the present investigation is discussed together with the previous spectroscopic results.

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Molecular dynamics mass spectrometric study of the collision-induced dissociation of CS2+ ions at low and intermediate collision energies

Cited by 14 publications

References 27 publications

Elaboration of an Impulsive Model for Collision-Induced Dissociation: Application to CS2+ + Ar .fwdarw. S+ + CS + Ar

Elaboration of an Impulsive Model for Collision-Induced Dissociation: Application to CS2+ + Ar .fwdarw. S+ + CS + Ar

Matrix Isolation and Cold Diffusion of Mass-Selected CS₂^•+ in Neon: Infrared Observation of the Asymmetric Stretch of CS₂^•+ and CS₂^•-

State-selected photodissociation dynamics of CS2+ in the C̃ 2Σg+ state

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Molecular dynamics mass spectrometric study of the collision-induced dissociation of CS2+ ions at low and intermediate collision energies

Cited by 14 publications

References 27 publications

Elaboration of an Impulsive Model for Collision-Induced Dissociation: Application to CS2+ + Ar .fwdarw. S+ + CS + Ar

Elaboration of an Impulsive Model for Collision-Induced Dissociation: Application to CS2+ + Ar .fwdarw. S+ + CS + Ar

Matrix Isolation and Cold Diffusion of Mass-Selected CS2•+ in Neon: Infrared Observation of the Asymmetric Stretch of CS2•+ and CS2•-

State-selected photodissociation dynamics of CS2+ in the C̃ 2Σg+ state

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Matrix Isolation and Cold Diffusion of Mass-Selected CS₂^•+ in Neon: Infrared Observation of the Asymmetric Stretch of CS₂^•+ and CS₂^•-