SELF-BROADENING COEFFICIENTS AND LINE STRENGTHS IN THE NU(3) BAND OF (CH3CL)-CL-35 AT LOW-TEMPERATURE

Self-broadened linewidths have been measured in the P- and R-branches of the v(3) band of (CH3Cl)-Cl-35 at 200 K using a tunable diode-laser spectrometer. The lines under study are located in the spectral range 706-751 cm(-1), with J values ranging from 3 to 27 and K from 3 to 6. The collisional half-widths were estimated along with the correspondi ng line strengths by fitting measured shapes of the individual lines w ith Voigt profiles convolved with the instrumental function. The line strengths at 200 K are in satisfactory agreement with results derived from previous measurements. Even though semi-classical calculations of line-broadening involving electrostatic interactions have yielded hal f-widths at 200 and 296 K that are greater than experimental data for low or medium values of J, they seem to predict correctly the K-depend ence of the broadening coefficients of lines with the same J transitio n as well as their temperature dependence.