N2-shift coefficients in the ν3 band of 12CH4 at room temperature

Bastien Vispoel, Miguel Dhyne, Claude Populaire, Ghislain Blanquet, Muriel Lepère

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    Using a dual beam diode-laser spectrometer, we have studied with accuracy the N2-shift coefficients in the P-branch of the υ3 band of methane. The experiments were performed at room temperature for 16 lines in the spectral range 2906-2948 cm-1 with J values between 7 and 11. Each line was recorded at four different nitrogen pressures ranging from 17 to 302 mbar. The collisional shifts were obtained by fitting to the experimental lineshape a Rautian-Sobel'Man profile that takes into account the Dicke narrowing. The shift coefficients were determined using a procedure where a non perturbed line of pure CH4 was simultaneously recorded with N2-shifted transitions. Finally, we give a comparison with previous published results.

    Translated title of the contributionCoefficients de déplacement dus à l'azote dans la bande ν3 du 12CH4 à température ambiante
    Original languageEnglish
    Pages (from-to)7-10
    JournalJournal of molecular spectroscopy
    Publication statusPublished - Apr 2014


    • Methane
    • Diode-laser spectroscopy
    • Line shifts


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