Collisional broadening and shift coefficients of lines in the ν45 band of 12C2H2 diluted in N2 from low to room temperatures

M. Dhyne, P. Joubert, J.-C. Populaire, M. Lepère

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Abstract

The pressure-induced N shift and broadening coefficients for nine lines of C H in the ν + ν band located around 1330 cm were measured using a tunable diode-laser spectrometer coupled with a low temperature absorption cell. The measurement of these coefficients was realized at six temperatures (between 173.2 and 298.2 K) in order to determine their temperature dependence. The broadening coefficients were obtained by fitting the Voigt lineshape, and the Rautian and the Galatry models which take into account the collisional narrowing due to molecular confinement, to the experimental profile. The shift coefficients were determined using a procedure where calibration lines were simultaneously recorded with transitions from the gas sample under study. In order to detect a possible velocity effect of the C H - N mixture, concentration and pressure dependences of the broadening coefficient were realized for five lines at room temperature. The results are compared with previous experimental data and also calculations. Our coefficients of collisional broadening, γ , obtained at different temperatures as well as the temperature dependence parameter, n, are in satisfactory agreement with previous studies. The pressure broadening coefficients, γ , are usually in good agreement with those reported for the same and other vibrational bands, indicating that they are insensitive to vibrational excitation. The pressure shift coefficients, δ , by contrast, were found to differ substantially among vibrational bands.
Original languageEnglish
Pages (from-to)973-989
Number of pages17
JournalJournal of Quantitative Spectroscopy and Radiative Transfer
Volume111
Issue number7-8
DOIs
Publication statusPublished - 1 May 2010

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shift
room temperature
coefficients
Temperature
laser spectrometers
pressure broadening
temperature dependence
Semiconductor lasers
Spectrometers
Gases
Calibration
pressure dependence
diodes
temperature
profiles
cells
gases
excitation

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title = "Collisional broadening and shift coefficients of lines in the ν4 +ν5 band of 12C2H2 diluted in N2 from low to room temperatures",
abstract = "The pressure-induced N shift and broadening coefficients for nine lines of C H in the ν + ν band located around 1330 cm were measured using a tunable diode-laser spectrometer coupled with a low temperature absorption cell. The measurement of these coefficients was realized at six temperatures (between 173.2 and 298.2 K) in order to determine their temperature dependence. The broadening coefficients were obtained by fitting the Voigt lineshape, and the Rautian and the Galatry models which take into account the collisional narrowing due to molecular confinement, to the experimental profile. The shift coefficients were determined using a procedure where calibration lines were simultaneously recorded with transitions from the gas sample under study. In order to detect a possible velocity effect of the C H - N mixture, concentration and pressure dependences of the broadening coefficient were realized for five lines at room temperature. The results are compared with previous experimental data and also calculations. Our coefficients of collisional broadening, γ , obtained at different temperatures as well as the temperature dependence parameter, n, are in satisfactory agreement with previous studies. The pressure broadening coefficients, γ , are usually in good agreement with those reported for the same and other vibrational bands, indicating that they are insensitive to vibrational excitation. The pressure shift coefficients, δ , by contrast, were found to differ substantially among vibrational bands.",
author = "M. Dhyne and P. Joubert and J.-C. Populaire and M. Lep{\`e}re",
note = "Copyright 2010 Elsevier B.V., All rights reserved.",
year = "2010",
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language = "English",
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T1 - Collisional broadening and shift coefficients of lines in the ν4 +ν5 band of 12C2H2 diluted in N2 from low to room temperatures

AU - Dhyne, M.

AU - Joubert, P.

AU - Populaire, J.-C.

AU - Lepère, M.

N1 - Copyright 2010 Elsevier B.V., All rights reserved.

PY - 2010/5/1

Y1 - 2010/5/1

N2 - The pressure-induced N shift and broadening coefficients for nine lines of C H in the ν + ν band located around 1330 cm were measured using a tunable diode-laser spectrometer coupled with a low temperature absorption cell. The measurement of these coefficients was realized at six temperatures (between 173.2 and 298.2 K) in order to determine their temperature dependence. The broadening coefficients were obtained by fitting the Voigt lineshape, and the Rautian and the Galatry models which take into account the collisional narrowing due to molecular confinement, to the experimental profile. The shift coefficients were determined using a procedure where calibration lines were simultaneously recorded with transitions from the gas sample under study. In order to detect a possible velocity effect of the C H - N mixture, concentration and pressure dependences of the broadening coefficient were realized for five lines at room temperature. The results are compared with previous experimental data and also calculations. Our coefficients of collisional broadening, γ , obtained at different temperatures as well as the temperature dependence parameter, n, are in satisfactory agreement with previous studies. The pressure broadening coefficients, γ , are usually in good agreement with those reported for the same and other vibrational bands, indicating that they are insensitive to vibrational excitation. The pressure shift coefficients, δ , by contrast, were found to differ substantially among vibrational bands.

AB - The pressure-induced N shift and broadening coefficients for nine lines of C H in the ν + ν band located around 1330 cm were measured using a tunable diode-laser spectrometer coupled with a low temperature absorption cell. The measurement of these coefficients was realized at six temperatures (between 173.2 and 298.2 K) in order to determine their temperature dependence. The broadening coefficients were obtained by fitting the Voigt lineshape, and the Rautian and the Galatry models which take into account the collisional narrowing due to molecular confinement, to the experimental profile. The shift coefficients were determined using a procedure where calibration lines were simultaneously recorded with transitions from the gas sample under study. In order to detect a possible velocity effect of the C H - N mixture, concentration and pressure dependences of the broadening coefficient were realized for five lines at room temperature. The results are compared with previous experimental data and also calculations. Our coefficients of collisional broadening, γ , obtained at different temperatures as well as the temperature dependence parameter, n, are in satisfactory agreement with previous studies. The pressure broadening coefficients, γ , are usually in good agreement with those reported for the same and other vibrational bands, indicating that they are insensitive to vibrational excitation. The pressure shift coefficients, δ , by contrast, were found to differ substantially among vibrational bands.

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