Photolytic production of S(1S) from OCS by two‐quantum and vibrationally dependent mechanisms

Autor:	D. J. Kligler, C. K. Rhodes, H. Pummer, William K. Bischel
Rok vydání:	1978
Předmět:	Atomic line Co2 laser Chemistry Absorption cross section General Physics and Astronomy Photochemistry Dissociation (chemistry) Excited state Physics::Atomic and Molecular Clusters Irradiation Physics::Chemical Physics Physical and Theoretical Chemistry Atomic physics Quantum Excitation
Zdroj:	The Journal of Chemical Physics. 69:4652-4661
ISSN:	1089-7690 0021-9606
DOI:	10.1063/1.436418
Popis:	Studies of photolytic production of S(1S) atoms by two‐photon dissociation of OCS at 193 nm are reported. The excited sulfur atoms are detected by observation of the collisionally‐induced XeS(2 1Σ+ →1 1Σ+) emission near the S(1S→1D) atomic line at 773 nm. The measured OCS two‐quantum absorption cross section is in accord with theoretical estimates based on previous established spectroscopic data. In addition, it is found that excitation of the OCS (ν2) bending vibration by CO2 laser irradiation causes the S(1S) yield to be considerably enhanced. The experimental data obtained indicate the presence of vibrational mode specificity in the mechanism of photolytic enhancement. Vibrationally dependent quenching arising from OCS† +S(1S) collisions is also observed. The mechanisms of vibrational enhancement are discussed in relation to their general applicability for photolytic production of electronically excited species.
Databáze:	OpenAIRE
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