Diode laser measurements of line strengths and collisional half-widths in the ν 1 band of OCS at 298 and 200K

Abstract

Absolute line strengths and self-broadened half-widths have been measured at 298 and 200 K for spectral lines ranging from J = 1 to 55 in the ν 1 band (860 cm -1) of 16O 12C 32S, using a tunable diode laser spectrometer. The vibrational transition moment (6.412 ± 0.16 × 10 -2D) as well as the absolute intensity (29.63±1.48 cm -2-atm -1 at 298 K), of the ν 1 band are determined from these line-strenght measurements. By applying two semi-classical impact theories of collisional broadening, we have obtained results for half-widths at 298 and 200 K which are significantly larger than the experimental data for | m|<50. However, the variation of the linewidths with temperature is well reproduced theoretically.