Analysis by kinetic modeling of the temperature dependence of thermal electron attachment to CF 3Br

Abstract

Experimental data from the literature for cross sections and rate constants for dissociative electron attachment to CF 3Br, with separately varied electron and gas temperatures, are analyzed by a kinetic modeling approach. The analysis suggests that electronic and nuclear contributions to the rate constants can be roughly separated, the former leading to a negative temperature coefficient, the latter to a positive temperature coefficient. The nuclear factor in the rate constant is found to be of Arrhenius form with an activation energy which is close to the energy of crossing of the CF 3Br and CF 3Br - potential curves along the CBr bond. © 2012 American Institute of Physics.