Аннотация:Gas phase molecules of hexachlorobenzene (C6Cl6) were investigated by means of Dissociative Electron Attachment Spectroscopy (DEAS). Three channels of molecular negative ions decay have been recorded: Clˉ and Cl2ˉ as well as electron detachment (t a ~250 ms at 343 K). All of these decay channels exhibit temperature dependence. The electron affinity was estimated within the framework of the simple Arrhenius model (EA=1.6–1.9 eV), as well as quantum-chemically at various levels (EA a =0.9–1.0 eV). The reasons for the discrepancy between the obtained estimates of the EA value and the results of previous works (EA from 1 to 2 eV) are discussed.