Oxygen Broadening of Acetylene Lines in the ν5Band at Low Temperature

Journal of Molecular Spectroscopy(1999)

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摘要
O2-broadening coefficients have been measured for 29 lines of C2H2at 173.2 K in thePandRbranches of the ν5band near 14 μm, using a tunable diode–laser spectrometer. The collisional widths obtained by Rautian profiles closely fitting the measured spectral shape of the lines are slightly larger than those derived from Voigt profiles. The broadening coefficients are compared with results calculated from a semiclassical theory, performed by considering, in addition to electrostatic interactions involving the hexadecapole moments of C2H2and O2, the atom–atom Lennard–Jones model. 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.
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