Ion-collision spectrometric study of the dissociation dynamics of S[sub 2][sup +] and CS[sup +] radicals

Journal Article · Sun Aug 01 04:00:00 EDT 1993 · Physical Review A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.48.1257· OSTI ID:6172621

Kumar, G R; Menon, L; Mathur, D ^[1]

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1. Tata Institute of Fundamental Research, Homi Bhabha Road, Bombay 400005 (India)

Collision-induced dissociation experiments on ground-state S[sub 2][sup +] and CS[sup +] have been carried out using a crossed-beam ion translational energy spectrometer with a very high angular resolution ([le]10[sup [minus]4] rad). The distributions of kinetic energies released upon dissociations S[sub 2][sup +][r arrow]S[sup +]+S, CS[sup +][r arrow]S[sup +]+C, and CS[sup +][r arrow]C[sup +]+S in 3-keV collisions with N[sub 2] have been measured; dissociation channels have been identified with the aid of computer simulations of trajectories through the apparatus of ions possessing different center-of-mass kinetic-energy release ([ital K][sub c.m.]) components. In the case of S[sup +] formation from S[sub 2][sup +], dissociation occurs via excitation to repulsive S[sub 2][sup +*] electronic states, giving rise to [ital K][sub c.m.] components of 1.5 and 2.0 eV; lower [ital K][sub c.m.] values (0 and 0.3 eV) are obtained upon dissociation of a bound excited state of S[sub 2][sup +] by a curve-crossing mechanism. Dissociation of CS[sup +] occurs via rotational resonances, giving rise to narrow, symmetrical structure in the S[sup +] translational energy spectrum; direct dissociation also occurs which yields relatively high [ital K][sub c.m.] values due to the breaking of the strong C[equivalent to]S triple bond. The CS[sup +][r arrow]C[sup +]+S channel is considerably weaker.

• OSTI ID: 6172621
• Journal Information: Physical Review A; (United States), Journal Name: Physical Review A; (United States) Vol. 48:2; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

664300* -- Atomic & Molecular Physics-- Collision Phenomena-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
BEAMS
CARBON COMPOUNDS
CARBON SULFIDES
CHALCOGENIDES
CHARGED PARTICLES
COLLIDING BEAMS
COLLISIONS
DIMERS
DISSOCIATION
ELEMENTS
ENERGY
ENERGY LEVELS
ENERGY RANGE
ENERGY SPECTRA
GROUND STATES
ION COLLISIONS
ION-MOLECULE COLLISIONS
IONS
KEV RANGE
KEV RANGE 01-10
KINETIC ENERGY
MEASURING INSTRUMENTS
MOLECULAR IONS
MOLECULE COLLISIONS
NITROGEN
NONMETALS
RADICALS
SPECTRA
SPECTROMETERS
SULFIDES
SULFUR COMPOUNDS
SULFUR IONS