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The collision cross section of the rotational transition J = 2 <- 1 of3,3,3-trifluoropropyne, CF3CCH, caused by rare gas perturbers has beendetermined by investigating transient emission signals of molecular gassamples. From analysis of the pressure dependence of the width of therotational line J = 2<-1 pressure broadening parameters have been derived forthe pure gas and for mixtures with the rare gases He, Ne, Ar, Kr and Xe. Thepressure shift parameter for the pure gas sigmas/p = 29.03(12) kHz/Pa also hasbeen obtained. Calculations based on the Anderson-Tsao-Curnutte theory usinginduction and dispersion interactions for the description of collisions ofCF3CCH with He, Ne, Ar, Kr and Xe, respectively, are in qualitative agreementwith the experimental results.

Collision Cross Section of the J = 2 <- 1 Rotational Transition of CF3CCH due to Higher Order Interactions