Line-mixing effects in He- and N2-broadened ∑← Π infrared Q branches of C2H2

J.-P. Bouanich, G. Blanquet, J. Walrand

Research output: Contribution to journalArticle

Abstract

Two Q branches of CH near 716.3 and 719.9 cm belonging to the (ν + ν) - ν/ and 2ν-ν bands, of 2 ∑ → Π symmetry, have been studied for He and N perturbers at pressures ranging from 0.05 to 1 atm, using a tunable diode-laser spectrometer. To interpret the line-mixing effects observed in these spectra, we have applied a model based on the energy-corrected sudden approximation whose parameters have been only derived from line-broadening data. This model provides satisfactory agreement with experimental bandshapes for both bands and perturbers, especially at pressures higher than 0.1 atm. The Q-branch profiles for CH-He are higher and narrower than those obtained for CH-N at the same pressure as the result of smaller broadening coefficients and larger line-mixing effects in the former system.
Original languageEnglish
Pages (from-to)41-48
Number of pages8
JournalJournal of molecular spectroscopy
Volume203
Issue number1
DOIs
Publication statusPublished - 1 Jan 2000

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methylidyne
Infrared radiation
laser spectrometers
Semiconductor lasers
Spectrometers
diodes
symmetry
coefficients
profiles
approximation
energy

Cite this

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title = "Line-mixing effects in He- and N2-broadened ∑← Π infrared Q branches of C2H2",
abstract = "Two Q branches of CH near 716.3 and 719.9 cm belonging to the (ν + ν) - ν/ and 2ν-ν bands, of 2 ∑ → Π symmetry, have been studied for He and N perturbers at pressures ranging from 0.05 to 1 atm, using a tunable diode-laser spectrometer. To interpret the line-mixing effects observed in these spectra, we have applied a model based on the energy-corrected sudden approximation whose parameters have been only derived from line-broadening data. This model provides satisfactory agreement with experimental bandshapes for both bands and perturbers, especially at pressures higher than 0.1 atm. The Q-branch profiles for CH-He are higher and narrower than those obtained for CH-N at the same pressure as the result of smaller broadening coefficients and larger line-mixing effects in the former system.",
author = "J.-P. Bouanich and G. Blanquet and J. Walrand",
note = "Copyright 2006 Elsevier B.V., All rights reserved.",
year = "2000",
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doi = "10.1006/jmsp.2000.8160",
language = "English",
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Line-mixing effects in He- and N2-broadened ∑← Π infrared Q branches of C2H2. / Bouanich, J.-P.; Blanquet, G.; Walrand, J.

In: Journal of molecular spectroscopy, Vol. 203, No. 1, 01.01.2000, p. 41-48.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Line-mixing effects in He- and N2-broadened ∑← Π infrared Q branches of C2H2

AU - Bouanich, J.-P.

AU - Blanquet, G.

AU - Walrand, J.

N1 - Copyright 2006 Elsevier B.V., All rights reserved.

PY - 2000/1/1

Y1 - 2000/1/1

N2 - Two Q branches of CH near 716.3 and 719.9 cm belonging to the (ν + ν) - ν/ and 2ν-ν bands, of 2 ∑ → Π symmetry, have been studied for He and N perturbers at pressures ranging from 0.05 to 1 atm, using a tunable diode-laser spectrometer. To interpret the line-mixing effects observed in these spectra, we have applied a model based on the energy-corrected sudden approximation whose parameters have been only derived from line-broadening data. This model provides satisfactory agreement with experimental bandshapes for both bands and perturbers, especially at pressures higher than 0.1 atm. The Q-branch profiles for CH-He are higher and narrower than those obtained for CH-N at the same pressure as the result of smaller broadening coefficients and larger line-mixing effects in the former system.

AB - Two Q branches of CH near 716.3 and 719.9 cm belonging to the (ν + ν) - ν/ and 2ν-ν bands, of 2 ∑ → Π symmetry, have been studied for He and N perturbers at pressures ranging from 0.05 to 1 atm, using a tunable diode-laser spectrometer. To interpret the line-mixing effects observed in these spectra, we have applied a model based on the energy-corrected sudden approximation whose parameters have been only derived from line-broadening data. This model provides satisfactory agreement with experimental bandshapes for both bands and perturbers, especially at pressures higher than 0.1 atm. The Q-branch profiles for CH-He are higher and narrower than those obtained for CH-N at the same pressure as the result of smaller broadening coefficients and larger line-mixing effects in the former system.

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