The Mg²⁺, K⁺, Zn²⁺, Ba²⁺, Co²⁺, Ag⁺, and Cd2+ salts of diethyl phosphoric acid have been γ-irradiated and observed by ESR in the temperature range between 77 and 300°K. The yield of the CH₃ C HOP( O)₂ OC₂ H₅⁻ radical is relatively independent of the associated cation, whereas formation of the CH₃ C H₂ and C₂ H₅ O P O₂⁻ radicals is depressed, or absent, in the Co²⁺, Ag⁺, and Cd2+ salts. It is concluded that the ethyl and ethylphosphite radicals are formed by dissociative electron attachment and that formation of CH₃ C HOP( O)₂ OC₂ H₅⁻ is independent of electron addition.
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Ezra et al. (1974) studied this question.