Temperature dependence of electron attachment and detachment in SF6 and c-C4F6

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Abstract
In the temperature, T, range of 300–600 K and the mean electron energy range 〈ε〉 of 0.19–1.0 eV, the total electron attachment rate constant for SF6 and c‐C4F6 measured in dilute mixtures with N2, is virtually independent of T. Under the same experimental conditions the stabilized SF−6 anion does not undergo autodetachment but the stabilized c‐C4F−6 anion undergoes a profound increase in autodetachment (by about four orders of magnitude). This difference between the SF−6 and the c‐C4F−6 anions is attributed to the larger electron affinity of the SF6 molecule compared to the c‐C4F6 molecule. The heat‐activated autodetachment for c‐C4F−6 is related to increases in the internal energy content of the c‐C4F−6 anion and is found to have an activation energy of 0.237 eV. The ‘‘limiting electric field strength’’ of SF6 was found to increase by ∼11% as T was increased from 300 to 600 K.