Translational kinetic energy release in dissociative electron attachment to C2Cl4, CCl4 , CFCl3, and 1,1,1-C2Cl3F3

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Abstract
Translational energy release in dissociative electron attachment to C2Cl4, CCl4 , CFCl3, and 1,1,1‐C2Cl3F3 has been investigated at subthermal electron energies through studies of collisions involving K(nd) Rydberg atoms. For CCl4 and CFCl3 , the observed mean translational energy release is in good agreement with the predictions of quasiequilibrium theories of unimolecular decay, suggesting that the excess energy of reaction is well‐distributed among the internal modes of the intermediate negative ion prior to dissociation. In contrast, the data for 1,1,1‐C2Cl3F3 indicate rapid dissociation before effective redistribution of the excess energy can occur. Implications of this as regards measurement of free‐electron attachment cross sections at very‐low energies are discussed.