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Applied Physics B

, Volume 97, Issue 2, pp 523–528 | Cite as

Buffer-gas pressure broadening for the 2ν 3 band of methane measured with continuous-wave cavity ring-down spectroscopy

  • D. Yamano
  • Y. Sakamoto
  • A. Yabushita
  • M. KawasakiEmail author
  • I. Morino
  • G. Inoue
Article

Abstract

Buffer-gas pressure broadening for the P(1), Q(1), R(0) and R(1) transitions in the 2ν 3 band of CH4 was investigated in the 1660 nm region. The pressure broadening coefficients, γ(gas), were determined for a variety of buffer gases: N2, O2, He, Ne, Ar, Kr and Xe. The γ values generally increased with increasing polarizability of the buffer gases. γ(air) are 0.056(2) for P(1), 0.056(1) for R(0), 0.061(1) for R(1) and 0.059(1) for Q(1) in units of cm−1 atm−1 where numbers in parentheses are one standard deviation in units of the last digits quoted. The temperature dependent parameter (broadening exponent) for air is 0.84(7) for P(1) within the temperature range 233–298 K.

PACS

33.20.Vq 33.70.Jg 42.55.Px 42.62.Fi 

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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • D. Yamano
    • 1
  • Y. Sakamoto
    • 1
  • A. Yabushita
    • 1
  • M. Kawasaki
    • 1
    Email author
  • I. Morino
    • 2
  • G. Inoue
    • 3
  1. 1.Department of Molecular EngineeringKyoto UniversityKyotoJapan
  2. 2.National Institute for Environmental StudiesTsukubaJapan
  3. 3.Research Institute for Humanity and NatureKyotoJapan

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