New insights into collision-induced rototranslational absorption and scattering spectra of gaseous methane at different temperatures

► We have determined an approximate interatomic potential for the interaction of methane. ► The different thermophysical and transport properties are calculated for this system. ► We have adopted a model for the induced dipole moment and anisotropy polarizability. ► The quantum lineshapes of absorption and scattering are computed at different temperatures.