Measurements of N2-broadening and pressure-shift coefficients in the ν3-band of 12CH4 using a cw-OPO

Mohammad Jahjah, Linh Nguyen, Marco P. Moreno, Malo Cadoret, Jean Jacques Zondy

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


We have measured the nitrogen-collision-induced line broadening and line shift coefficients of three singlet lines - P(1), R(0) and R(1) - belonging to the ν3 band of methane (12CH4) at 3.29-3.32μm using direct laser absorption spectroscopy by means of a continuous-wave mid-IR optical parametric oscillator. Owing to the well-isolated features of the singlet lines, the lineshapes were modeled with a simple Voigt profile in order to retrieve the line parameter coefficients. The values of the N2-broadening and pressure-shift coefficients agree fairly well with the previously published ones that use either Fourier-transform or mid-infrared difference-frequency spectrometers along with more complex analytic spectroscopic models.

Original languageEnglish
Pages (from-to)251-259
Number of pages9
JournalJournal of Quantitative Spectroscopy and Radiative Transfer
Publication statusPublished - Jan 1 2015
Externally publishedYes


  • Laser spectroscopy
  • Line parameters
  • Methane
  • Optical parametric oscillator

ASJC Scopus subject areas

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

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