γ-Irradiation of solid ammonium compounds at low temperatures nay lead to the formation and trapping of radicals generated from the parent ammonium ions. Thus, NH3+ was observed in NH4PF61and N(CH3)3,+was found in tetramethyl ammonium halides2. Recently it has been shown that γ-irradiation of tetraalkylammonium iodides at 77 °K leads to the breaking of a C-C bond next to the nitrogen atom3in agreement with the mass spectrometrlc studies of amines which show the fission of the α, β-C-C bond as the primary process upon electron impact4.