N₂-collisional broadening coefficients of lines in the ν₂ band of chloromethane from low to room temperatures

Using a high-resolution tunable diode-laser spectrometer, we measured N₂-collisional broadening coefficients in the ν₂ band of chloromethane. Measurements have been realized for 15 lines at room temperature and 5 lines at different low temperatures. For each line under study, we have recorded spectra at 4 pressures of perturber gas ranging from 12 to 55 mbar. The experimental line profiles, at each pressure and each temperature, have been fitted with three different line shape models. From these fits, we obtained the collisional half-width and accurately deduced N₂-broadening coefficients at up to 4 temperatures between 200 K and 296 K. Using the usual empirical power law, we determined the temperature dependence parameter of the N₂-broadening coefficients.