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

Abstract The 3.4 µm-spectral region of methyl chloride was recently studied in terms of line positions, intensities and self- and N 2 -broadening coefficients. In this work, the temperature dependence of self- and N 2 -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 N 2 -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 N 2 - temperature dependence exponent (from J =0 to 40).