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Type: Journal article
Title: Vibrational relaxation of CO₂ (12⁰1) by argon
Other Titles: Vibrational relaxation of CO(2) (12 degrees 1) by argon
Author: Alwahabi, Z.
Zetterberg, J.
Li, Z.
Alden, M.
Citation: Chemical Physics, 2009; 359(1-3):71-76
Publisher: Elsevier Science BV
Issue Date: 2009
ISSN: 0301-0104
Statement of
Z.T. Alwahabi, J. Zetterberg, Z.S. Li, M. Aldén
Abstract: We present experimental measurements of the vibrational relaxation of CO2 (1 20 1) by argon, at ambient temperature (295 ± 2 K). The CO2 molecules were directly excited to the (1 20 1, J = 14) ro-vibrational state by a tunable laser radiation at ∼2 μm. Time-resolved infrared fluorescence technique was used to study the collisional relaxation process. The bimolecular deactivation rate constant of CO2 (1 20 1) by argon was found to be (825 ± 43 Torr-1 s-1) while the self-deactivation by CO2 (0 00 0) was determined to be (3357 ± 135 Torr-1 s-1). The radiative life-time of the vibrational combination band (1 20 1), τ[CO2 (1 20 1)], was found to be (5.55 ± 0.27) μs. Modern angular momentum theory was used to explain values of the deactivation rate measured. It is concluded that the presence of the (0 80 0) state acts like an angular momentum sink leading to a fast deactivation rate of the CO2 (1 20 1) by argon. © 2009 Elsevier B.V. All rights reserved.
Keywords: Vibrational relaxation
energy transfer
time-resolved IR fluorescence
Rights: © 2009 Elsevier B.V. All rights reserved.
DOI: 10.1016/j.chemphys.2009.03.008
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Chemical Engineering publications

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