Broadening and collisional interference of lines in the IR spectra of ammonia: Self-broadening in the ν1 band

M. R. Cherkasov

    Research output: Contribution to journalArticle


    The relaxation parameters of the lines of the P, Q, and R branches of the ν1 ammonia ν1 band are calculated in the case of self-broadening. In the case of doublets, the effects of collisional interference of the doublet components have been taken into account. It is shown that the cross-relaxation parameters of the components can reach ~60% of the values of the self-broadening coefficients, which gives rise to the narrowing of the components and indicates that the isolated line approximation is inapplicable. Comparison with experimental data is made. Good agreement for self-broadening coefficients is obtained. In the case of the self-shift coefficients, discrepancies are considerable in both magnitude and sign, and it is impossible to elucidate their reasons without invoking additional experimental data.

    Original languageEnglish
    Pages (from-to)859-871
    Number of pages13
    JournalOptics and Spectroscopy (English translation of Optika i Spektroskopiya)
    Issue number6
    Publication statusPublished - 1 Jun 2017


    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Atomic and Molecular Physics, and Optics

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