Hydrogen-broadening coefficients in the ν5 band of acetylene at low temperature

J.-P. Bouanich, J. Walrand, G. Blanquet

    Research output: Contribution to journalArticlepeer-review


    H-broadening coefficients have been measured for 29 lines of CH at 173.2 K in the P and R branches of the ν fundamental band near 13.7 μm, using a tunable diode-laser spectrometer. These lines were individually fitted with a Voigt and a Rautian profile in order to determine the collisional widths. The resulting broadening coefficients are compared with values calculated from a semiclassical theory performed by considering, in addition to electrostatic interactions, the atom-atom Lennard-Jones model. A satisfactory agreement is obtained but only for low and medium J values. By comparing broadening coefficients at 297 and 173.2 K from a simple power law, the temperature dependence of these broadenings has been determined both experimentally and theoretically.
    Original languageEnglish
    Pages (from-to)266-270
    Number of pages5
    JournalJournal of molecular spectroscopy
    Issue number2
    Publication statusPublished - 1 Jan 2002

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