Doctoral Dissertations

Date of Award

12-1982

Degree Type

Dissertation

Degree Name

Doctor of Philosophy

Major

Physics

Major Professor

Loucas G. Christophorou

Committee Members

Solon Georghiou

Abstract

By means of electron swarm experiments, electron attach-ment to pentafluorobenzene (C6HF5) in nitrogen (N2) and to oxygen (O2) in various gas mixtures has been studied. variation of the electron attachment rate for C6HF5 in N2 the gas pressure and with the mean electron energy was determined. The lifetime of the species C6HF-*5 against autoionization was deduced and the electron attachment cross section for C6HF5 was calculated. The influence of the permanent electric dipole of C6HF5 upon the electron attachment process is discussed.

Electron attachment to O2 in P-10 (90% argon + 10% methane) and in mixtures of various polar molecules with N2 was investigated. As a preliminary to these studies electron drift velocities in P-10 and in the various mixtures of polar species with N2 were determined. These drift velocities are reported and discussed. The variation of the electron attachment rate for O2 in P-10 with the P-10 pressure and the mean electron energy was determined. The attachment rate as a function of mean electron energy was found to possess distinct structure. Models which account for this structure and for the variation of the attachment rate with the P-10 pressure are advanced and the corresponding reaction rate constants are presented. electron attachment rates for O2 in mixtures of N2 with 1-butene, dimethyl amine, ammonia, trifluoromethane, and acetaldehyde were measured. Models of the variation of the attachment rate with the concentration of the polar species are advanced and the corresponding reaction rate constants are presented.

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