Abstract
Rotational lines of methyl chloride CH335Cl in collision with He, Ar, and Kr have been recorded at room temperature in the 186–901GHz range (6.2–30.1cm−1) for J=6→7, 10→11, 17→18, 22→23, 31→32, 33→34 and K=0–6. Owing to the high sensitivity of the frequency-modulated spectrometer used, clear deviations of the recorded line-shapes from the usual Voigt profile have been observed and their additional analyses with more refined models (Speed-Dependent Voigt, Galatry and Speed-Dependent Galatry profiles) have been performed. It has been evidenced that the observed line-shapes are mainly governed by the speed-dependence of relaxation rates (“wind effect”) and that the optical diffusion related to velocity changing collisions (Dicke effect) has a nearly negligible role.
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