Line parameters of 12 CH 4 around 2.008 μm studied by tunable diode laser spectroscopy with a long-path White cell

The absorption spectrum of CH412 at 2.008 μm has been recorded at 296 K, using a high-resolution tunable diode laser absorption spectrometer combined with a long-path, multi-pass White cell. The line positions, intensities, and self-broadening coefficients for 32 transitions of the lower part of the Tetradecad in the 4975–4985  cm−1 spectral range of CH412 have been measured. To our knowledge, no experimental information has been obtained for the self-broadening coefficients of these lines before. Comparisons of the line parameters determined in the present work with those from HITRAN2016 line lists are provided.