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Oxygen, nitrogen and air broadening of HCN spectral lines at terahertz frequencies

✍ Scribed by Chun Yang; Jeanna Buldyreva; Iouli E. Gordon; François Rohart; Arnaud Cuisset; Gaël Mouret; Robin Bocquet; Francis Hindle

Publisher: Elsevier Science
Year: 2008
Tongue: English
Weight: 970 KB
Volume: 109
Category: Article
ISSN: 0022-4073
DOI: 10.1016/j.jqsrt.2008.08.005

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✦ Synopsis

The room-temperature nitrogen-and oxygen-broadening coefficients of hydrogen cyanide spectral lines have been measured in the 0.5-3 THz (17-100 cm À1 ) frequency range (purely rotational transitions with 5pJp36) by a continuous-wave terahertz spectrometer based on a photomixing source. An improved version of the Robert and Bonamy semiclassical formalism has been used to calculate the oxygen-broadening coefficients and resulted in a good agreement with these measurements. The nitrogen and oxygen data are combined to provide the air-broadening coefficients as used by the HITRAN database. A significant difference is observed between the measured and tabulated values for transitions with high values of the rotational quantum number. A new polynomial representation is suggested for inclusion in HITRAN. A similar polynomial expression has been derived for the nitrogen broadening to aid the studies of Titan's atmosphere.

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