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. Kawasaki, I. Morino, G. Inoue

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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 -1atm-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.

Original languageEnglish
Pages (from-to)523-528
Number of pages6
JournalApplied Physics B: Lasers and Optics
Issue number2
Publication statusPublished - Oct 1 2009
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)
  • Physics and Astronomy(all)

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