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Title: Diode laser probing of the low frequency vibrational modes of baths of CO sub 2 and N sub 2 O 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} and N{sub 2}O has been investigated. Dilute NO{sub 2} mixtures were excited by a pulse from an excimer pumped dye laser operating at 495 nm. Various vibrational modes of the bath gases were probed with continuous wave IR diode lasers. Less than 20% of the energy initially placed in the NO{sub 2} by the dye laser is taken up by the vibrational degrees of freedom of the CO{sub 2} or N{sub 2}O baths. For N{sub 2}O, the three different vibrational modes ({nu}{sub 1}=1285 cm{sup {minus}1}, {nu}{sub 2}=589 cm{sup {minus}1}, {nu}{sub 3}=2223 cm{sup {minus}1}) take up almost equal amounts of energy from NO{sub 2}, but the number of vibrational quanta produced in the bath is found to increase with decreasing vibrational frequency. Similar results are found for CO{sub 2} except that the {nu}{sub 1} and {nu}{sub 2} modes cannot be studied separately for this bath gas due to rapid {nu}{sub 1}{leftrightarrow}{nu}{sub 2} intermode equilibration.

Authors:
; ; ;  [1]
  1. (Department of Chemistry, Columbia University, New York, NY (USA) Columbia Radiation Laboratory, Columbia University, New York, NY (USA))
Publication Date:
OSTI Identifier:
5989578
DOE Contract Number:  
FG02-88ER13937
Resource Type:
Journal Article
Journal Name:
Journal of Chemical Physics; (USA)
Additional Journal Information:
Journal Volume: 93:12; Journal ID: ISSN 0021-9606
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; CARBON DIOXIDE; VIBRATIONAL STATES; NITROGEN DIOXIDE; RADIATIONLESS DECAY; NITROUS OXIDE; ENERGY TRANSFER; EXCITED STATES; INFRARED SPECTRA; MOLECULE-MOLECULE COLLISIONS; RELAXATION; CARBON COMPOUNDS; CARBON OXIDES; CHALCOGENIDES; COLLISIONS; DE-EXCITATION; ENERGY LEVELS; ENERGY-LEVEL TRANSITIONS; MOLECULE COLLISIONS; NITROGEN COMPOUNDS; NITROGEN OXIDES; OXIDES; OXYGEN COMPOUNDS; SPECTRA; 640304* - Atomic, Molecular & Chemical Physics- Collision Phenomena

Citation Formats

Chou, J.Z., Hewitt, S.A., Hershberger, J.F., and Flynn, G.W. Diode laser probing of the low frequency vibrational modes of baths of CO sub 2 and N sub 2 O excited by relaxation of highly excited NO sub 2. United States: N. p., 1990. Web. doi:10.1063/1.459286.
Chou, J.Z., Hewitt, S.A., Hershberger, J.F., & Flynn, G.W. Diode laser probing of the low frequency vibrational modes of baths of CO sub 2 and N sub 2 O excited by relaxation of highly excited NO sub 2. United States. doi:10.1063/1.459286.
Chou, J.Z., Hewitt, S.A., Hershberger, J.F., and Flynn, G.W. Sat . "Diode laser probing of the low frequency vibrational modes of baths of CO sub 2 and N sub 2 O excited by relaxation of highly excited NO sub 2". United States. doi:10.1063/1.459286.
@article{osti_5989578,
title = {Diode laser probing of the low frequency vibrational modes of baths of CO sub 2 and N sub 2 O excited by relaxation of highly excited NO sub 2},
author = {Chou, J.Z. and Hewitt, S.A. and Hershberger, J.F. and Flynn, G.W.},
abstractNote = {Quenching of highly excited vibrational states of NO{sub 2} in baths of CO{sub 2} and N{sub 2}O has been investigated. Dilute NO{sub 2} mixtures were excited by a pulse from an excimer pumped dye laser operating at 495 nm. Various vibrational modes of the bath gases were probed with continuous wave IR diode lasers. Less than 20% of the energy initially placed in the NO{sub 2} by the dye laser is taken up by the vibrational degrees of freedom of the CO{sub 2} or N{sub 2}O baths. For N{sub 2}O, the three different vibrational modes ({nu}{sub 1}=1285 cm{sup {minus}1}, {nu}{sub 2}=589 cm{sup {minus}1}, {nu}{sub 3}=2223 cm{sup {minus}1}) take up almost equal amounts of energy from NO{sub 2}, but the number of vibrational quanta produced in the bath is found to increase with decreasing vibrational frequency. Similar results are found for CO{sub 2} except that the {nu}{sub 1} and {nu}{sub 2} modes cannot be studied separately for this bath gas due to rapid {nu}{sub 1}{leftrightarrow}{nu}{sub 2} intermode equilibration.},
doi = {10.1063/1.459286},
journal = {Journal of Chemical Physics; (USA)},
issn = {0021-9606},
number = ,
volume = 93:12,
place = {United States},
year = {1990},
month = {12}
}