TEMPERATURE DEPENDENCE OF PRESSURE BROADENED LINEWIDTH OF J = 1 <= 0 ROTATIONAL TRANSITION OF CH_3C~(14)N MOLECULE MIXED WITH OCS AND H_2 MOLECULE

摘要

The temperature dependence of the pressure-broadening parameters of the J = 1 <= 0 rotational transition of OCS and H_2 in the ground vibrational state of CH_3C~(14)N molecule is measured in the temperature range between 248 and 293 K. The line shape of the absorption is recorded with a Stark modulated microwave spectrometer. Using least squares fits of the data to the Voigt line function, several contributions to the linewidth have been deduced. The experimental results are compared with the calculated results using Murphy and Boggs collision broadening theory. The pressure-broadening parameters C_w(x) of the gas mixture CH_3CN+OCS and CH_3CN+H_2 are 14.05 ±0.30 MHz/Tr, 9.15 ±0.12 MHz/Tr, respectively and the temperature dependence parameters α are -0.90 ± 0.07 and -0.77 ± 0.08.