Helium-induced halfwidths and line shifts of water vapor transitions of the v1 + v2 and v2 + v3 bands

Abstract

The collisional broadening () and shift () coefficients of more than 100 absorption rovibrational lines of the 1 + 2 and 2 + 3 bands of the water vapor molecule in a H2O-He mixture were measured with the help of a Fourier-transform spectrometer over a large range of helium pressures. The shift coefficients are mainly positive and have an unusual rotational dependence, in contrast to the line center shift induced by other mono-atomic gases. The calculations of coefficients and are performed in the framework of the semi-classical method. The rotational dependence of these shift coefficients is explained by the rotational dependence of the isotropic intermolecular potential. The influence of accidental resonances in the H2O molecule is also discussed.

Original language	English
Pages (from-to)	43-51
Number of pages	9
Journal	Molecular Physics
Volume	107
Issue number	1
DOIs	https://doi.org/10.1080/00268970802698655
Publication status	Published - 2009

Keywords

Accidental resonances
Line broadening shift coefficients
Semi-classical impact method
Water-vapor absorption spectrum

ASJC Scopus subject areas

Physical and Theoretical Chemistry
Condensed Matter Physics
Biophysics
Molecular Biology

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10.1080/00268970802698655

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title = "Helium-induced halfwidths and line shifts of water vapor transitions of the v1 + v2 and v2 + v3 bands",

abstract = "The collisional broadening () and shift () coefficients of more than 100 absorption rovibrational lines of the 1 + 2 and 2 + 3 bands of the water vapor molecule in a H2O-He mixture were measured with the help of a Fourier-transform spectrometer over a large range of helium pressures. The shift coefficients are mainly positive and have an unusual rotational dependence, in contrast to the line center shift induced by other mono-atomic gases. The calculations of coefficients and are performed in the framework of the semi-classical method. The rotational dependence of these shift coefficients is explained by the rotational dependence of the isotropic intermolecular potential. The influence of accidental resonances in the H2O molecule is also discussed.",

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language = "English",

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pages = "43--51",

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T1 - Helium-induced halfwidths and line shifts of water vapor transitions of the v1 + v2 and v2 + v3 bands

AU - Solodov, A. M.

AU - Starikov, V. I.

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Y1 - 2009

N2 - The collisional broadening () and shift () coefficients of more than 100 absorption rovibrational lines of the 1 + 2 and 2 + 3 bands of the water vapor molecule in a H2O-He mixture were measured with the help of a Fourier-transform spectrometer over a large range of helium pressures. The shift coefficients are mainly positive and have an unusual rotational dependence, in contrast to the line center shift induced by other mono-atomic gases. The calculations of coefficients and are performed in the framework of the semi-classical method. The rotational dependence of these shift coefficients is explained by the rotational dependence of the isotropic intermolecular potential. The influence of accidental resonances in the H2O molecule is also discussed.

AB - The collisional broadening () and shift () coefficients of more than 100 absorption rovibrational lines of the 1 + 2 and 2 + 3 bands of the water vapor molecule in a H2O-He mixture were measured with the help of a Fourier-transform spectrometer over a large range of helium pressures. The shift coefficients are mainly positive and have an unusual rotational dependence, in contrast to the line center shift induced by other mono-atomic gases. The calculations of coefficients and are performed in the framework of the semi-classical method. The rotational dependence of these shift coefficients is explained by the rotational dependence of the isotropic intermolecular potential. The influence of accidental resonances in the H2O molecule is also discussed.

KW - Accidental resonances

KW - Line broadening shift coefficients

KW - Semi-classical impact method

KW - Water-vapor absorption spectrum

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Helium-induced halfwidths and line shifts of water vapor transitions of the v₁ + v₂ and v₂ + v₃ bands

Abstract

Keywords

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