High temperature negative ions: Electron impact of As4 vapor

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Abstract
Appearance potentials and ion translational energies have been measured for the negative ions As−, As2−, and As3− formed by dissociative resonance capture of As4. The following thermochemical values (all in kilocalorie/mole) have been obtained: Δ Hf,298o(As2−)=43.1± 4.5; Δ Hf,298o(As3−)=38.3± 4.3; E.A.(As2)=2.4± 4.1; E.A.(As3)=19.3± 8.2 and Δ Hf,298o(As3)=57.6± 3.9 . The measurement of the increase in translational energy through resonance gave α = 0.43 for the three processes studied.