Collision Cross Section of the J = 2 <- 1 Rotational Transition of   CF3CCH due to Higher Order Interactions
  The collision cross section of the rotational transition J = 2 <- 1 of 3,3,3-trifluoropropyne, CF3CCH, caused by rare gas perturbers has been determined by investigating transient emission signals of molecular gas samples. From analysis of the pressure dependence of the width of the rotational line J = 2<-1 pressure broadening parameters have been derived for the pure gas and for mixtures with the rare gases He, Ne, Ar, Kr and Xe. The pressure shift parameter for the pure gas sigmas/p = 29.03(12) kHz/Pa also has been obtained. Calculations based on the Anderson-Tsao-Curnutte theory using induction and dispersion interactions for the description of collisions of CF3CCH with He, Ne, Ar, Kr and Xe, respectively, are in qualitative agreement with the experimental results. 
H. Maeder, J. Galica, E. Mis-Kuzminska and S. Gierszal