K-dependence and temperature dependence of N2- and O2-broadening coefficients for the J=14–13 transition of methyl chloride CH335Cl

Extensive experiments on the K=5 component of the J=14–13 rotational transition of CH335Cl, 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.