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

A. M. Solodov, V. I. Starikov

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    18 Citations (Scopus)

    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 languageEnglish
    Pages (from-to)43-51
    Number of pages9
    JournalMolecular Physics
    Volume107
    Issue number1
    DOIs
    Publication statusPublished - 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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