4.5 Article

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

Journal

JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
Volume 109, Issue 17-18, Pages 2857-2868

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jqsrt.2008.08.005

Keywords

HCN; Oxygen; Nitrogen; Broadening; Terahertz; Photomixing

Funding

  1. Agence De I'Environnement et de la Maitrise de I'Energie (ADEME),
  2. European Commission
  3. Delegation Generale pour I'Armement [06.34.037]
  4. Laboratoire de Physico-Chimie de I'Atmosphere
  5. Laboratoire de Physique des Lasers
  6. Centre d'Etudes et de Recherches Lasers et Applications (CERLA)

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The room-temperature nitrogen- and oxygen-broadening coefficients of hydrogen cyanide spectral lines have been measured in the 0.5-3THz (17-100cm(-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. (c) 2008 Elsevier Ltd. All rights reserved.

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