Diode-laser measurements of collisional line broadening in the nu5 band of C2H2

Details Diode-laser measurements of collisional line broadening in the nu5 band of C2H2 Diode-laser measurements of collisional line broadening in the nu5 band of C2H2

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jqsrt..45..145l&link_type=abstract

Journal of Quantitative Spectroscopy and Radiative Transfer (ISSN 0022-4073), vol. 45, March 1991, p. 145-155.

Physics

18

Acetylene, Atomic Collisions, Intermolecular Forces, Laser Spectrometers, Line Spectra, Semiconductor Lasers, Atomic Interactions, Electrostatics, Polyatomic Molecules, Spherical Harmonics, Tunable Lasers

Scientific paper

Self-broadening coefficients for 27 lines of acetylene in the P- and R-branches of the nu5 band have been measured at room temperature with a tunable diode-laser spectrometer. These broadening coefficients have been calculated on the basis of two semiclassical impact models by using a simple intermolecular potential. The quadrupole moment of C2H2 as well as a dispersion parameter have then been determined by fitting the calculated results of experimental data. The approach of Robert and Bonamy is then used in which the intermolecular potential does not include adjustable parameters and involves the addition of an atom-atom interaction model to the electrostatic interactions. The usual spherical harmonics expansion of the atom-atom potential appears to be quite inadequate at short distances. The results of calculations derived from a rough consideration of the exact radial expansion of the atom-atom potential lead to better agreement for high J lines than those derived from the truncated expansion.

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