N2-collisional broadening coefficients of lines in the [formula omitted] band of chloromethane from low to room temperatures.

• Measurement of N 2 -broadening coefficients in the ν 2 band of chloromethane. • High resolution diode-laser spectroscopy. • Temperature dependence of broadening coefficient at low temperatures. Using a high-resolution tunable diode-laser spectrometer, we measured N 2 -collisional broadening coefficients in the ν 2 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 N 2 -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 N 2 -broadening coefficients. [ABSTRACT FROM AUTHOR]