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The study of Rydberg gas chemistry by fast flow glow discharge mass spectrometry. / Paul Michael Dickinson

Swansea University Author: Paul Michael Dickinson

Abstract

This study concerns the analysis of processes occurring within, and fundamental characteristics of the flowing afterglow of a fast flowing direct current glow discharge plasma by both mass spectrometric and electrical diagnostic techniques. The evidence presented within this thesis indicates that th...

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Published: 2008
Institution: Swansea University
Degree level: Doctoral
Degree name: Ph.D
URI: https://cronfa.swan.ac.uk/Record/cronfa42439
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first_indexed 2018-08-02T18:54:42Z
last_indexed 2019-10-21T16:47:49Z
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spelling 2018-08-29T14:36:06.8177614 v2 42439 2018-08-02 The study of Rydberg gas chemistry by fast flow glow discharge mass spectrometry. 0d821e04c6f92614bb094b8ff168a2d7 NULL Paul Michael Dickinson Paul Michael Dickinson true true 2018-08-02 This study concerns the analysis of processes occurring within, and fundamental characteristics of the flowing afterglow of a fast flowing direct current glow discharge plasma by both mass spectrometric and electrical diagnostic techniques. The evidence presented within this thesis indicates that the glow discharge plasma studied contains a high density of very highly excited state, Rydberg species. Classically, glow discharge plasma is considered to be a partially ionised gas, the chemistry of which is dominated by processes involving charged particles (ions and electrons). However, under the conditions of the fast flow glow discharge source it is thought that the formation and stabilisation of Rydberg atoms is highly favourable, and thus the plasma chemistry can be described by a Rydberg gas model. Theoretical thermodynamic and kinetic data based on calculations (unpublished at the time of submission) performed by Dr R. S. Mason which corroborate this model are also presented. Studies of the influence of the magnitude and polarity of applied the ion exit bias on the electrical properties of the flowing afterglow plasma and active discharge region were undertaken, often in situ with mass spectrometric measurements. Comparison of the electrical and mass spectrometric measurements has provided valuable information about the properties of the Rydberg gas plasma and the ionisation processes within the afterglow plasma. The results of the electrical studies (current and double probe measurements) could not be explained for an ion electron medium. The reactions of secondary gases (H[2], CO, CO[2], N[2], CF[4] and CH[4]) and organic vapours to the flowing afterglow plasma have been studied for a range of conditions. The results of which cannot all be explained by ion-molecule processes, and seemingly conform to the Rydberg gas model. E-Thesis Analytical chemistry. 31 12 2008 2008-12-31 COLLEGE NANME Swansea University Medical School COLLEGE CODE Swansea University Doctoral Ph.D 2018-08-29T14:36:06.8177614 2018-08-02T16:24:29.2597915 Faculty of Medicine, Health and Life Sciences Swansea University Medical School - Medicine Paul Michael Dickinson NULL 1 0042439-02082018162454.pdf 10798147.pdf 2018-08-02T16:24:54.5000000 Output 22056720 application/pdf E-Thesis true 2018-08-02T16:24:54.5000000 false
title The study of Rydberg gas chemistry by fast flow glow discharge mass spectrometry.
spellingShingle The study of Rydberg gas chemistry by fast flow glow discharge mass spectrometry.
Paul Michael Dickinson
title_short The study of Rydberg gas chemistry by fast flow glow discharge mass spectrometry.
title_full The study of Rydberg gas chemistry by fast flow glow discharge mass spectrometry.
title_fullStr The study of Rydberg gas chemistry by fast flow glow discharge mass spectrometry.
title_full_unstemmed The study of Rydberg gas chemistry by fast flow glow discharge mass spectrometry.
title_sort The study of Rydberg gas chemistry by fast flow glow discharge mass spectrometry.
author_id_str_mv 0d821e04c6f92614bb094b8ff168a2d7
author_id_fullname_str_mv 0d821e04c6f92614bb094b8ff168a2d7_***_Paul Michael Dickinson
author Paul Michael Dickinson
author2 Paul Michael Dickinson
format E-Thesis
publishDate 2008
institution Swansea University
college_str Faculty of Medicine, Health and Life Sciences
hierarchytype
hierarchy_top_id facultyofmedicinehealthandlifesciences
hierarchy_top_title Faculty of Medicine, Health and Life Sciences
hierarchy_parent_id facultyofmedicinehealthandlifesciences
hierarchy_parent_title Faculty of Medicine, Health and Life Sciences
department_str Swansea University Medical School - Medicine{{{_:::_}}}Faculty of Medicine, Health and Life Sciences{{{_:::_}}}Swansea University Medical School - Medicine
document_store_str 1
active_str 0
description This study concerns the analysis of processes occurring within, and fundamental characteristics of the flowing afterglow of a fast flowing direct current glow discharge plasma by both mass spectrometric and electrical diagnostic techniques. The evidence presented within this thesis indicates that the glow discharge plasma studied contains a high density of very highly excited state, Rydberg species. Classically, glow discharge plasma is considered to be a partially ionised gas, the chemistry of which is dominated by processes involving charged particles (ions and electrons). However, under the conditions of the fast flow glow discharge source it is thought that the formation and stabilisation of Rydberg atoms is highly favourable, and thus the plasma chemistry can be described by a Rydberg gas model. Theoretical thermodynamic and kinetic data based on calculations (unpublished at the time of submission) performed by Dr R. S. Mason which corroborate this model are also presented. Studies of the influence of the magnitude and polarity of applied the ion exit bias on the electrical properties of the flowing afterglow plasma and active discharge region were undertaken, often in situ with mass spectrometric measurements. Comparison of the electrical and mass spectrometric measurements has provided valuable information about the properties of the Rydberg gas plasma and the ionisation processes within the afterglow plasma. The results of the electrical studies (current and double probe measurements) could not be explained for an ion electron medium. The reactions of secondary gases (H[2], CO, CO[2], N[2], CF[4] and CH[4]) and organic vapours to the flowing afterglow plasma have been studied for a range of conditions. The results of which cannot all be explained by ion-molecule processes, and seemingly conform to the Rydberg gas model.
published_date 2008-12-31T03:52:58Z
_version_ 1763752624394338304
score 11.036531

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