State-to-state photodissociation of carbonyl sulfide ({nu}{sub 2}=0,1|JlM). II. The effect of initial bending on coherence of S({sup 1}D{sub 2}) polarization

Journal Article · Sat Oct 22 04:00:00 EDT 2005 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.2076647· OSTI ID:20723170

Brom, Alrik J. van den; Rakitzis, T Peter; Janssen, Maurice H. M. ^[1]

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1. Laser Center and Department of Chemistry, Vrije Universiteit, de Boelelaan 1083, 1081 HV Amsterdam (Netherlands)

Photodissociation studies using ion imaging are reported, measuring the coherence of the polarization of the S({sup 1}D{sub 2}) fragment from the photolysis of single-quantum state-selected carbonyl sulfide (OCS) at 223 and 230 nm. A hexapole state-selector focuses a molecular beam of OCS parent molecules in the ground state ({nu}{sub 2}=0 vertical bar JM=10) or in the first excited bending state ({nu}{sub 2}=1 vertical bar JlM=111). At 230 nm photolysis the Im[a{sub 1}{sup (1p}{sub arallel}{sup ,perpendicular})] moment for the fast S({sup 1}D{sub 2}) channel increases by about 50% when the initial OCS parent state changes from the vibrationless ground state to the first excited bending state. No dependence on the initial bending state is found for photolysis at 223 nm. We observe separate rings in the slow channel of the velocity distribution of S({sup 1}D{sub 2}) correlating to single CO(J) rotational states. The additional available energy for photolysis at 223 nm is found to be channeled mostly into the CO(J) rotational motion. An improved value for the OC-S bond energy D{sub 0}=4.292 eV is reported.

• OSTI ID: 20723170
• Journal Information: Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 16 Vol. 123; ISSN JCPSA6; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
BINDING ENERGY
CARBON OXYSULFIDE
DISSOCIATION
EV RANGE 01-10
GROUND STATES
MOLECULAR BEAMS
OXYGEN COMPOUNDS
PHOTOLYSIS
PHOTON-MOLECULE COLLISIONS
POLARIZATION
ROTATIONAL STATES