Lineshape models testing on CH4 spectral line 6105.6257 cm−1 (R9F1, R9F2) of 2ν3 band broadened by N2 and Ne

Abstract

The experimental spectra of CH4 absorption lines in the spectral region of 6105–6107cm−1 have been measured in binary mixtures with N2 and Ne by a high-resolution photo-acoustic laser spectrometer. Lineshape models, including Dicke narrowing and speed dependent effects were used to CH4 spectral line (ν0=6105.62573cm−1) fitting. The hard-, soft-collision and speed dependence models lead to better fits of experiments than the Voigt profile, but the systematic residuals and biases in the retrieved line parameters are remained.