Electron attachment and compound formation in flames. VII. Electron attachment in flames containing phosphorus and potassium

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Abstract
The addition of phosphorus to a series of potassium‐seeded H2/O2/N2 flames results in the formation of negative ions accompanied by a decrease in free electron concentrations. The ions have been identified mass spectrometrically as PO2−. Equilibrium constants for the reaction HPO2+e=PO2−+H have been measured by determining the ratio [PO2−]/[e] in four flames of known temperature and composition. Analysis of the results via both second and third law methods yields ΔH °298=−6.1±6 kcal mole−1 for the above reaction and ΔHf,298 (PO−2) =−146 ±6 kcal mole−1. The electron affinity of PO−2 from these results is 85±6 kcal mole−1 (3.7±0.3 eV).

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