Electron Attachment and Detachment. II. Mixtures of O2 and CO2 and of O2 and H2O

Abstract
Electron‐attachment coefficients in O2–CO2 and O2–H2O mixtures and electron‐attachment—detachment equilibrium constants for O2–CO2 mixtures are obtained from drift‐tube measurements similar to those used previously for O2. The three‐body attachment coefficients involving O2 and CO2 are 3.1×10−30, 4.0×10−30, and 2.7×10−30 cm6/sec at 300°, 477°, and 525°K. The electron—negative‐ion equilibrium constant data correspond to the formation of a CO4 with a large degree of freedom of internal motion and with an energy of dissociation into O2 and CO2 of 0.8 eV. The three‐body attachment coefficient involving O2 and H2O is 1.4±0.2×10−29 cm6/sec at 300° and 395°K. In O2–H2O mixtures at temperatures of 500° and 555°K we observe the conversion of O2 to a more stable negative‐ion form which shows no evidence of dissociation or detachment.