Temperature dependence for self- and N2-broadening coefficients of CH3Cl

•FTS high-resolution study of methyl chloride at 3.4 μm.•Measurements of self- and N2-broadening coefficients at low temperature.•J-rotational dependence of the temperature exponents.

The 3.4 µm-spectral region of methyl chloride was recently studied in terms of line positions, intensities and self- and N2-broadening coefficients. In this work, the temperature dependence of self- and N2-broadening coefficients was retrieved from high resolution Fourier transform spectra recorded at temperatures between 200 K and 270 K. 230 self-broadening coefficients and 103 N2-broadening coefficients were measured using a multispectrum fitting procedure. The accuracy on the widths measurements was estimated to be around 10%. No K-rotational was observed on the extracted temperature exponents. The model describing the J-rotational dependence of the temperature exponents is available to generate fitted values of both self- and N2- temperature dependence exponent (from J=0 to 40).