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Dissertation
Spectroscopic studies of equilibrium sulfur vapor
Doctor of Philosophy (Ph.D.), Drexel University
Nov 1992
DOI:
https://doi.org/10.17918/00000479
Abstract
This thesis is concerned with two areas involving the spectroscopy of equilibrium sulfur vapor. First, the visible and ultraviolet absorption spectra of mixtures of equilibrium sulfur were studied. The purpose of these studies was to determine the vapor-phase absorption spectra of the sulfur allotropes between S2 and S8. Second, the time-decays and fluorescence spectra of vapor which was predicted to be almost entirely S2 were studied. The purpose of these studies was to determine the number of components, their identities, and their respective lifetimes. Equilibrium sulfur vapor contains a mixture of several allotropic forms. The number of allotropes present changes with temperature and pressure. Absorption spectra measured for sulfur vapor are therefore composite spectra, which until recently, were difficult to solve. In this thesis, factor analysis methods were applied to these vapor-phase mixture spectra to determine the identity and spectrum of each absorbing component. The results were: (1) The determination of the vapor-phase pure-component absorption spectra for S2, S3, S4, S6, S7, S8. (2) Concentrations of each of these allotropes present in the mixtures. The absorption and fluorescence spectra of vapor-phase S2 has been studied extensively over the past century usually at temperatures well above 600 C. In this thesis, fluorescence measurements were performed in the 600-700 C range where a small amount of S3 is present according to thermodynamic predictions. The time-integrated fluorescence spectra in this temperature range show the expected vibrational progression in S2 with some very weak extraneous features. The temporal decay curves exhibit double-exponential behavior indicating the presence of two fluorescencing components. The result is the measured fluorescence spectra and lifetimes for S2 and S3.
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Details
- Title
- Spectroscopic studies of equilibrium sulfur vapor
- Creators
- Richard Billmers
- Contributors
- Allan L. Smith (Advisor)
- Awarding Institution
- Drexel University
- Degree Awarded
- Doctor of Philosophy (Ph.D.)
- Publisher
- Drexel University; Philadelphia, Pennsylvania
- Number of pages
- xiii, 185 pages
- Resource Type
- Dissertation
- Language
- English
- Academic Unit
- College of Arts and Sciences; Chemistry; Drexel University
- Other Identifier
- 991014970194304721