Date of Award

2002

Degree Type

Dissertation

Degree Name

Ph.D.

Department

Physics

First Advisor

McConkey, J. W.,

Keywords

Physics, Molecular.

Rights

CC BY-NC-ND 4.0

Abstract

Laser Induced Fluorescence (LIF) techniques have been used to study the OH (X) and OD (X) radicals produced following electron impact dissociation of water, methanol, and heavy water. Impact energies ranged from the important near threshold region (<10 eV) up to 300 eV. A magnetically collimated electron beam has been used for this purpose. Absolute dissociation cross section measurements for the production of the OH (X) and OD (X) states have been obtained for the first time and reveal that this dissociation channel is a major contributor to the overall cross section for electron scattering. At 75 eV, the maximum value for the production of OH (X) from dissociation of water is 2.1 x 10-16 cm2. The cross section shape reveals that dipole allowed transitions are the dominant channels from which the OH (X) molecules are produced. The OD (X) from heavy water was studied as well to check for any isotopic effects. The OD (X) dissociation cross section was put on absolute scale by comparing to the cross section of that of water. A cross section ratio, sigmaH2O/sigma D2O = 0.9 was obtained. Finally comparison of the signal from electron impact dissociation of methanol to that of water enabled us to put the production of OH (X) fragments on an absolute scale. The value obtained was sigmaCH3OH/sigma H2O = 0.7. Cross section data and OH (X) rotational distributions from the different target molecules revealed significant details about the dissociation mechanisms and pathways.Dept. of Physics. Paper copy at Leddy Library: Theses & Major Papers - Basement, West Bldg. / Call Number: Thesis2002 .H365. Source: Dissertation Abstracts International, Volume: 64-01, Section: B, page: 0268. Adviser: J. W. McConkey. Thesis (Ph.D.)--University of Windsor (Canada), 2002.

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