Photofragmentation dynamics of carbon suboxide
Nascent CO photofragment vibrational energy distributions from the UV photolysis of C/sub 2/ O/sub 2/ are measured by time-resolved carbon monoxide laser absorption spectroscopy. Photodissociation of C/sub 3/O/sub 2/ at 193 and 249 nm produces CO(nu = 0-5) and CO(nu = 1-3), respectively. The CO photofragment is rotationally excited to some extent in both cases. A statistical model for energy disposal fits the experimentally determined CO vibrational energy distributions for 193- and 249-nm photolyses. A Franck-Condon model for vibrational energy partitioning cannot reproduce the experimental observations. The data suggest that following absorption of a UV photon C/sub 3/O/sub 2/ internally converts to the electronic ground state and then dissociates, yielding C/sub 2/O(a/sup 1/..delta..) and CO(X/sup 1/..sigma../sup +/). The photofragmentation dynamics of C/sub 3/O/sub 2/ are compared with those of the quasi-linear polyatomics, CH/sub 2/CO and NCNO.
- Research Organization:
- Univ. of California, Davis
- OSTI ID:
- 5469545
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 90:17; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400500* -- Photochemistry
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Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ABSORPTION SPECTROSCOPY
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON MONOXIDE LASERS
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
DATA
DECOMPOSITION
ELECTROMAGNETIC RADIATION
ENERGY LEVELS
EXCITED STATES
EXPERIMENTAL DATA
GAS LASERS
INFORMATION
KINETICS
LASERS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
RADIATIONS
REACTION KINETICS
ROTATIONAL STATES
SPECTROSCOPY
TRANSIENTS
ULTRAVIOLET RADIATION
VIBRATIONAL STATES