Measurements and calculations of He-broadening and -shifting parameters of the water vapor transitions of the ν 1+ ν 2+ ν 3 band

T. M. Petrova, A. M. Solodov, V. I. Starikov, A. A. Solodov

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    Abstract

    The water vapor line broadening and shift in the ν 1+ ν 2+ ν 3 band induced by helium pressure were measured using a Bruker IFS 125HR FTIR spectrometer. The measurements were performed at room temperature at a spectral resolution of 0.01cm 1 and in a wide He pressure range. The shifting coefficients δ are mainly positive, in contrast to the line center shift induced by other mono-atomic gases. Calculations of the coefficients γ and δ were performed in the framework of the semi-classical method. The influence of the rotational dependence of the isotropic intermolecular potential and accidental resonances in the H 2O molecule on the shifting coefficients is discussed. Calculated values of line profile parameters are in a good agreement with observed parameters.

    Original languageEnglish
    Pages (from-to)1493-1503
    Number of pages11
    JournalMolecular Physics
    Volume110
    Issue number14
    DOIs
    Publication statusPublished - 20 Jul 2012

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    Keywords

    • line broadening and shifting coefficients
    • profile of spectral line
    • semi-classical method

    ASJC Scopus subject areas

    • Biophysics
    • Molecular Biology
    • Condensed Matter Physics
    • Physical and Theoretical Chemistry

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