K-dependence and temperature dependence of N2- and O2-broadening coefficients for the JZ14–13 transition of methyl chloride CH3 35Cl

Extensive experiments on the KZ5 component of the JZ14–13 rotational transition of CH3 35Cl, located near 372 GHz, were performed at different temperatures in the range 235–350 K. They allow the determination of the N2- and O2-broadening coefficients, and their temperature dependences. More specific measurements on a great number of K-components of the involved transition perturbed by N2 at 301 K allow to point out a clear decreasing of the broadening coefficients with increasing K. All the experimental parameters are compared with results derived from a semiclassical calculation of collisional interactions, including electrostatic, induction, and dispersion energy contributions. q 2005 Elsevier B.V. All rights reserved