Diode-Laser Measurements of N2-Broadening Coefficients in the ν2 Band of HCN at Low Temperature

C. Schmidt, J.-C. Populaire, J. Walrand, G. Blanquet, J.P. Bouanich

Research output: Contribution to journalArticle

Abstract

N-broadening coefficients have been measured for 28 lines of HCN at 203 K in the P, Q, and R branches of the ν band, using a tunable diode-laser spectrometer. Semiclassical calculations of these collisional broadenings have been performed using two intermolecular anisotropic potentials as well as two isotropic potentials to describe the trajectory model: one is the Lennard-Jones potential, and the other is a spherical average of the atom-atom model. The parameters of the atom-atom model and those of the Lennard-Jones potentials have been calculated for HCN by fitting experimental values of second viral coefficients. The calculated broadening coefficients are significantly larger, especially for the lines with J > 10, than the experimental data. By comparing the results obtained at room and low temperatures. the temperature dependence of line widths has been determined both theoretically and experimentally.
Original languageEnglish
Pages (from-to)423-432
Number of pages10
JournalJournal of molecular spectroscopy
Volume158
Issue number2
DOIs
Publication statusPublished - 1 Apr 1993

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Semiconductor lasers
semiconductor lasers
Lennard-Jones potential
Atoms
coefficients
atoms
laser spectrometers
Temperature
Linewidth
Spectrometers
diodes
Trajectories
trajectories
temperature dependence
room temperature

Cite this

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title = "Diode-Laser Measurements of N2-Broadening Coefficients in the ν2 Band of HCN at Low Temperature",
abstract = "N-broadening coefficients have been measured for 28 lines of HCN at 203 K in the P, Q, and R branches of the ν band, using a tunable diode-laser spectrometer. Semiclassical calculations of these collisional broadenings have been performed using two intermolecular anisotropic potentials as well as two isotropic potentials to describe the trajectory model: one is the Lennard-Jones potential, and the other is a spherical average of the atom-atom model. The parameters of the atom-atom model and those of the Lennard-Jones potentials have been calculated for HCN by fitting experimental values of second viral coefficients. The calculated broadening coefficients are significantly larger, especially for the lines with J > 10, than the experimental data. By comparing the results obtained at room and low temperatures. the temperature dependence of line widths has been determined both theoretically and experimentally.",
author = "C. Schmidt and J.-C. Populaire and J. Walrand and G. Blanquet and J.P. Bouanich",
note = "Copyright 2008 Elsevier B.V., All rights reserved.",
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Diode-Laser Measurements of N2-Broadening Coefficients in the ν2 Band of HCN at Low Temperature. / Schmidt, C.; Populaire, J.-C.; Walrand, J.; Blanquet, G.; Bouanich, J.P.

In: Journal of molecular spectroscopy, Vol. 158, No. 2, 01.04.1993, p. 423-432.

Research output: Contribution to journalArticle

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T1 - Diode-Laser Measurements of N2-Broadening Coefficients in the ν2 Band of HCN at Low Temperature

AU - Schmidt, C.

AU - Populaire, J.-C.

AU - Walrand, J.

AU - Blanquet, G.

AU - Bouanich, J.P.

N1 - Copyright 2008 Elsevier B.V., All rights reserved.

PY - 1993/4/1

Y1 - 1993/4/1

N2 - N-broadening coefficients have been measured for 28 lines of HCN at 203 K in the P, Q, and R branches of the ν band, using a tunable diode-laser spectrometer. Semiclassical calculations of these collisional broadenings have been performed using two intermolecular anisotropic potentials as well as two isotropic potentials to describe the trajectory model: one is the Lennard-Jones potential, and the other is a spherical average of the atom-atom model. The parameters of the atom-atom model and those of the Lennard-Jones potentials have been calculated for HCN by fitting experimental values of second viral coefficients. The calculated broadening coefficients are significantly larger, especially for the lines with J > 10, than the experimental data. By comparing the results obtained at room and low temperatures. the temperature dependence of line widths has been determined both theoretically and experimentally.

AB - N-broadening coefficients have been measured for 28 lines of HCN at 203 K in the P, Q, and R branches of the ν band, using a tunable diode-laser spectrometer. Semiclassical calculations of these collisional broadenings have been performed using two intermolecular anisotropic potentials as well as two isotropic potentials to describe the trajectory model: one is the Lennard-Jones potential, and the other is a spherical average of the atom-atom model. The parameters of the atom-atom model and those of the Lennard-Jones potentials have been calculated for HCN by fitting experimental values of second viral coefficients. The calculated broadening coefficients are significantly larger, especially for the lines with J > 10, than the experimental data. By comparing the results obtained at room and low temperatures. the temperature dependence of line widths has been determined both theoretically and experimentally.

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