The dynamics of electron-induced reactions in condensed trifluoroiodomethane (CF3I) were studied under ultrahigh vacuum conditions. Seven CF3I radiolysis products (C2F6, C2F5I, C2F3I, CF2I2, C2F4I2, CFI3, and C2F3I3) were identified using temperature programmed desorption experiments conducted after irradiation with 4 eV electrons. Although C2F6 formation at energies above 4 eV is ascribed to electron-induced electronic excitation followed by prompt dissociation of the C?I bond to form �CF3 radicals that dimerize, the formation of the other six radiolysis products at low sub-ionization incident electron energies is attributed to dissociative electron attachment (DEA) because of the observed resonance peaks in the radiolysis product yields as a function of incident electron energy (~ 2 eV to ~ 7 eV). All seven CF3I electron-induced reaction products were also identified following irradiation with 500 eV electrons. While dissociative electron attachment and/or electron impact excitation may play an important role in high-energy radiation induced synthesis of the high-yield product C2F6, a dramatic enhancement of up to ~ 2�104 in product yield per electron at 500 eV relative to that at 4 eV for some products suggests, however, that DEA is not the dominant mechanism for the high-energy radiation-induced synthesis of those products.

Role of low-energy electrons in the high-energy radiolysis of condensed CF<sub>3</sub>I

239th National Meeting (2010)

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Role of low-energy electrons in the high-energy radiolysis of condensed CF3I

Role of low-energy electrons in the high-energy radiolysis of condensed CF₃I