Diode laser probing of vibrational, rotational, and translational excitation of CO sub 2 following collisions with O( sup 1 D). I. Inelastic scattering

Journal Article · Sat Sep 01 04:00:00 EDT 1990 · Journal of Chemical Physics; (USA)

DOI:https://doi.org/10.1063/1.458861· OSTI ID:6361800

Zhu, L; Kreutz, T G; Hewitt, S A; Flynn, G W ^[1]

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1. Department of Chemistry, Columbia University, New York, NY (USA) Columbia Radiation Laboratory, Columbia University, New York, NY (USA)

Time domain diode laser absorption spectroscopy has been used to measure state-specific energy deposition in the vibrational, rotational, and translational degrees of freedom of CO{sub 2} following the 248 nm photolysis of ozone in a low pressure mixture of CO{sub 2}, O{sub 3}, and O{sub 2}. Nascent rotational population distributions have been measured in a number of low-lying CO{sub 2} vibrational levels, including 00{sup 0}0, 01{sup 1}0, 02{sup 2}0, 02{sup 0}0, 03{sup 3}0, 10{sup 0}0, and 00{sup 0}1. In addition, measurements of CO{sub 2} translational excitation have been obtained for the majority of the rovibrational states which were probed. The results suggest that the prompt absorption signals observed so far arise from inelastic scattering between CO{sub 2} and the translationally hot O({sup 1}D) and O{sub 2}({sup 1}{Delta}) photofragments rather than electronic quenching of O({sup 1}D) to O({sup 3}P) by collisions with CO{sub 2}. Simple calculations indicate that the latter process should provide substantially more CO{sub 2} rotational and translational excitation than is observed here.

• DOE Contract Number: FG02-88ER13937
• OSTI ID: 6361800
• Journal Information: Journal of Chemical Physics; (USA), Journal Name: Journal of Chemical Physics; (USA) Vol. 93:5; ISSN JCPSA; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
ATOM-MOLECULE COLLISIONS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
COLLISIONS
DECOMPOSITION
ELEMENTS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITATION
EXCITED STATES
INELASTIC SCATTERING
LASER SPECTROSCOPY
MOLECULE COLLISIONS
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
OZONE
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
ROTATIONAL STATES
SCATTERING
SPECTROSCOPY
VIBRATIONAL STATES