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Oxygen Broadening of Acetylene Lines in the ν5Band at Low Temperature

✍ Scribed by Jean-Pierre Bouanich; Ghislain Blanquet; Jacques Walrand

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
147 KB
Volume
194
Category
Article
ISSN
0022-2852

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✦ Synopsis

O 2 -broadening coefficients have been measured for 29 lines of C 2 H 2 at 173.2 K in the P and R branches of the 5 band near 14 m, 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 C 2 H 2 and O 2 , 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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