A statistical model for the density dependence of electron attachment to O2 molecules
1981; Elsevier BV; Volume: 63; Issue: 1-2 Linguagem: Inglês
10.1016/0301-0104(81)80312-6
ISSN1873-4421
Autores Tópico(s)Advanced Chemical Physics Studies
ResumoVarious studies of the density and temperature dependence of the electron attachment rate to O2 molecules for several O2, M binary gas mixtures suggest that the electron attachment process strongly deviates from the Bloch—Bradbury two-step process. An idealized formalism which enables one to incorporate together single-step, two-step, three-step and all higher order attachment processes is described. It models all electron capture processes for attaching molecules simultaneously interacting with zero, one, two or more other molecules within an effective range over which the electron-M molecule interaction significantly influences the electron capture rate. Results obtained in another paper are rederived from a different point of view. When this model is fitted to attachment data for O2, binary mixtures with C2H4, C2H6 and CO2 the effective ranges are found to be of the order 7.5, 11 and 12 Å respectively. Various processes which can contribute to environmental effects on the electron capture process are discussed. In particular, the relation between the present formalism and the Fermi shift of a low energy negative ion resonance energy is demonstrated. The close similarity between our formalism for describing environmental effects on the electron capture rate and the theory of spectral line broadening is pointed out.
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