Diode-Laser Measurements of N2-Broadening Coefficients in the ν2 Band of HCN at Low Temperature

C. Schmidt, J.-C. Populaire, J. Walrand, G. Blanquet, J.P. Bouanich

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    N-broadening coefficients have been measured for 28 lines of HCN at 203 K in the P, Q, and R branches of the ν band, using a tunable diode-laser spectrometer. Semiclassical calculations of these collisional broadenings have been performed using two intermolecular anisotropic potentials as well as two isotropic potentials to describe the trajectory model: one is the Lennard-Jones potential, and the other is a spherical average of the atom-atom model. The parameters of the atom-atom model and those of the Lennard-Jones potentials have been calculated for HCN by fitting experimental values of second viral coefficients. The calculated broadening coefficients are significantly larger, especially for the lines with J > 10, than the experimental data. By comparing the results obtained at room and low temperatures. the temperature dependence of line widths has been determined both theoretically and experimentally.
    langue originaleAnglais
    Pages (de - à)423-432
    Nombre de pages10
    journalJournal of molecular spectroscopy
    Numéro de publication2
    Les DOIs
    Etat de la publicationPublié - 1 avr. 1993

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