Scattering cross sections for electrons in C₂H₂F₄and its mixtures with Ar from measured transport coefficients

Abstract

Previous measurements of the drift velocities, W, and the density-normalized effective ionization (multiplication) coefficients (ionization minus attachment), (α − η)/N, measured in C2H2F4 (1,1,1,2 tetrafluoroethane) and in C2H2F4–Ar mixtures have been analysed with a standard swarm procedure. As a result of this analysis a set of electron collision cross sections for the C2H2F4 molecule has been obtained. This set has been further used to calculate other transport parameters such as the characteristic energies and rate coefficients for individual processes.