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Oxygen,nitrogen and air broadening of HCN spectral lines at terahertz frequencies |
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| Authors: | Chun Yang Jeanna Buldyreva Iouli E Gordon François Rohart Arnaud Cuisset Gaël Mouret Robin Bocquet Francis Hindle |
| Institution: | 1. Laboratoire de Physico-Chimie de l’Atmosphère, UMR CNRS 8101, Université du Littoral Côte d’Opale, 189A Av. Maurice Schumann, 59140 Dunkerque, France;2. Institut UTINAM, UMR CNRS 6213, Université de Franche-Comte, 16, Route de Gray, 25030 Besançon Cedex, France;3. Harvard-Smithsonian Center for Astrophysics, Atomic and Molecular Physics Division, 60 Garden Street, Cambridge, MA 02138-1516, USA;4. Laboratoire de Physique des Lasers, Atomes et Molécules, UMR CNRS 8523, Bâtiment P5-135, Université de Lille 1, 59655 Villeneuve d’Ascq Cedex, France |
| Abstract: | 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?1) frequency range (purely rotational transitions with 5?J?36) 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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