Intensities, broadening and narrowing parameters in the ν3 band of methane

Et-touhami Es-sebbar, Aamir Farooq

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


The P-branch of methane's ν3 band is probed to carry out an extensive study of the 2905-2908cm-1 infrared spectral region. Absolute line intensities as well as N2-, O2-, H2-, He-, Ar- and CO2-broadening coefficients are determined for nine transitions at room temperature. Narrowing parameters due to the Dicke effect have also been investigated. A narrow emission line-width (~0.0001cm-1) difference-frequency-generation (DFG) laser system is used as the tunable light source. To retrieve the CH4 spectroscopic parameters, Voigt and Galatry profiles were used to simulate the measured line shape of the individual transitions.
Original languageEnglish (US)
Pages (from-to)241-252
Number of pages12
JournalJournal of Quantitative Spectroscopy and Radiative Transfer
StatePublished - Dec 2014

ASJC Scopus subject areas

  • Spectroscopy
  • Atomic and Molecular Physics, and Optics
  • Radiation


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