Excitation of CO sub 2 by energy transfer from highly vibrationally excited benzene derivatives

Journal Article · Sun Dec 01 04:00:00 EST 1991 · Journal of Chemical Physics; (United States)

DOI:https://doi.org/10.1063/1.461290· OSTI ID:5008370

Toselli, B M; Barker, J R ^[1]

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1. Department of Atmospheric, Oceanic, and Space Sciences, Department of Chemistry, Space Physics Research Laboratory, The University of Michigan, Ann Arbor, Michigan (USA)

The time-resolved infrared fluorescence technique has been used to study {ital V}--{ital V} and {ital V}--{ital T}/{ital R} energy transfer to carbon dioxide from highly excited benzene, benzene-{ital d}{sub 6}, toluene, and toluene-{ital d}{sub 8}. The highly vibrationally excited aromatics in the electronic ground state are obtained by radiationless transitions after pumping with a KrF laser at 248 nm to the {ital S}{sub 1} excited electronic level. The {ital V}--{ital V} energy transfer from the excited parent to the asymmetric stretch mode of CO{sub 2} was measured by observing the characteristic emission of CO{sup *}{sub 2} near 4.3 {mu}m. From these measurements, the probability per collision of formation of CO{sup *}{sub 2} was determined as a function of the internal energy in the excited aromatic. In all cases investigated, this probability is {le}0.1% at the initial excitation energy of 40 000 cm{sup {minus}1} and it is approximately directly proportional to the vibrational energy of the excited aromatic. The total concentration of CO{sup *}{sub 2} produced as a result of the many collisions needed to totally deactivate the excited aromatic amounted to {gt}5% of the initial concentration of the excited aromatic and the quantitative values obtained are in excellent agreement with other work.

• OSTI ID: 5008370
• Journal Information: Journal of Chemical Physics; (United States), Journal Name: Journal of Chemical Physics; (United States) Vol. 95:11; 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
ALKYLATED AROMATICS
AROMATICS
ASYMMETRY
BENZENE
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
COLLISIONS
EMISSION SPECTRA
ENERGY LEVELS
ENERGY TRANSFER
ENERGY-LEVEL TRANSITIONS
EXCIMER LASERS
EXCITATION
EXCITED STATES
FLUORESCENCE
GAS LASERS
GROUND STATES
HYDROCARBONS
INFRARED SPECTRA
LASERS
LUMINESCENCE
MOLECULE COLLISIONS
MOLECULE-MOLECULE COLLISIONS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
RESOLUTION
SPECTRA
TIME RESOLUTION
TIMING PROPERTIES
TOLUENE
VIBRATIONAL STATES