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Title: Diode laser probing of the high-frequency vibrational modes of baths of CO sub 2 , N sub 2 O, and CO excited by relaxation of highly excited NO sub 2

Abstract

Quenching of highly excited vibrational states of NO{sub 2} in baths of CO{sub 2}, N{sub 2}O, and CO has been investigated. Dilute NO{sub 2} mixtures were excited by a pulse from an excimer pumped dye laser operating at 495 nm. The {nu}{sub 3} antisymmetric stretching modes of CO{sub 2} (2349 cm{sup {minus}1}) and N{sub 2}O (2223 cm{sup {minus}1}) and the {ital v}=1 level of CO (2143 cm{sup {minus}1}) were probed with continuous wave IR diode lasers. The amount of energy transferred from excited NO{sub 2} to the {nu}{sub 3} modes of both CO{sub 2} and N{sub 2}O was found to be 3%{plus minus}1% of the original excitation energy. On the other hand, a smaller amount of energy (0.9%{plus minus}0.3%) was deposited into the CO vibrational mode for NO{sub 2} contained in a dilute CO bath. These results support a picture of very inefficient transfer from high energy states of donor molecules to the high-frequency vibrational modes of small bath molecules. Differences in the efficiency of energy reception by the high-frequency modes of these three molecules scale roughly as the infrared transition moments for the bath states indicating the importance of resonance effects in the energy transfer process, but a combinationmore » of short- and long-range force mechanisms is probably necessary to account for the observed differences.« less

Authors:
; ; ; ; ; ;  [1]
  1. (Department of Chemistry and Columbia Radiation Laboratory, Columbia University, New York, New York 10027 (US))
Publication Date:
OSTI Identifier:
5249826
Resource Type:
Journal Article
Journal Name:
Journal of Chemical Physics; (USA)
Additional Journal Information:
Journal Volume: 91:9; Journal ID: ISSN 0021-9606
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; CARBON DIOXIDE; VIBRATIONAL STATES; CARBON MONOXIDE; NITROGEN DIOXIDE; RADIATIONLESS DECAY; NITROUS OXIDE; ENERGY TRANSFER; ENERGY-LEVEL TRANSITIONS; FLUORESCENCE; LASER RADIATION; MOLECULE-MOLECULE COLLISIONS; QUENCHING; RELAXATION; RESONANCE; TRANSITION AMPLITUDES; AMPLITUDES; CARBON COMPOUNDS; CARBON OXIDES; CHALCOGENIDES; COLLISIONS; DE-EXCITATION; ELECTROMAGNETIC RADIATION; ENERGY LEVELS; EXCITED STATES; LUMINESCENCE; MOLECULE COLLISIONS; NITROGEN COMPOUNDS; NITROGEN OXIDES; OXIDES; OXYGEN COMPOUNDS; RADIATIONS; 640304* - Atomic, Molecular & Chemical Physics- Collision Phenomena; 400201 - Chemical & Physicochemical Properties

Citation Formats

Chou, J.Z., Hewitt, S.A., Hershberger, J.F., Brady, B.B., Spector, G.B., Chia, L., and Flynn, G.W. Diode laser probing of the high-frequency vibrational modes of baths of CO sub 2 , N sub 2 O, and CO excited by relaxation of highly excited NO sub 2. United States: N. p., 1989. Web. doi:10.1063/1.457588.
Chou, J.Z., Hewitt, S.A., Hershberger, J.F., Brady, B.B., Spector, G.B., Chia, L., & Flynn, G.W. Diode laser probing of the high-frequency vibrational modes of baths of CO sub 2 , N sub 2 O, and CO excited by relaxation of highly excited NO sub 2. United States. doi:10.1063/1.457588.
Chou, J.Z., Hewitt, S.A., Hershberger, J.F., Brady, B.B., Spector, G.B., Chia, L., and Flynn, G.W. Wed . "Diode laser probing of the high-frequency vibrational modes of baths of CO sub 2 , N sub 2 O, and CO excited by relaxation of highly excited NO sub 2". United States. doi:10.1063/1.457588.
@article{osti_5249826,
title = {Diode laser probing of the high-frequency vibrational modes of baths of CO sub 2 , N sub 2 O, and CO excited by relaxation of highly excited NO sub 2},
author = {Chou, J.Z. and Hewitt, S.A. and Hershberger, J.F. and Brady, B.B. and Spector, G.B. and Chia, L. and Flynn, G.W.},
abstractNote = {Quenching of highly excited vibrational states of NO{sub 2} in baths of CO{sub 2}, N{sub 2}O, and CO has been investigated. Dilute NO{sub 2} mixtures were excited by a pulse from an excimer pumped dye laser operating at 495 nm. The {nu}{sub 3} antisymmetric stretching modes of CO{sub 2} (2349 cm{sup {minus}1}) and N{sub 2}O (2223 cm{sup {minus}1}) and the {ital v}=1 level of CO (2143 cm{sup {minus}1}) were probed with continuous wave IR diode lasers. The amount of energy transferred from excited NO{sub 2} to the {nu}{sub 3} modes of both CO{sub 2} and N{sub 2}O was found to be 3%{plus minus}1% of the original excitation energy. On the other hand, a smaller amount of energy (0.9%{plus minus}0.3%) was deposited into the CO vibrational mode for NO{sub 2} contained in a dilute CO bath. These results support a picture of very inefficient transfer from high energy states of donor molecules to the high-frequency vibrational modes of small bath molecules. Differences in the efficiency of energy reception by the high-frequency modes of these three molecules scale roughly as the infrared transition moments for the bath states indicating the importance of resonance effects in the energy transfer process, but a combination of short- and long-range force mechanisms is probably necessary to account for the observed differences.},
doi = {10.1063/1.457588},
journal = {Journal of Chemical Physics; (USA)},
issn = {0021-9606},
number = ,
volume = 91:9,
place = {United States},
year = {1989},
month = {11}
}