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Proceedings Paper

Production Of Ground State Atomic Oxygen In A Multifactor Stress Environment
Author(s): W. C. Neely; T. C. Yang; J. P. Wey; E. J. Clothiaux; S. D. Worley
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Paper Abstract

A system for the production of ground state atomic oxygen, 0(3P), has been constructed and tested. Prime importance has been given to the use of a generation method in which the 0-atom flux could be accurately characterized with respect to both the exact identity and the absolute flux of the 0-atom species produced. Additionally, the system has been designed to permit multi-factor stress studies of test samples while they are being exposed to the 0-atom flux. A modular system of construction has been used for maximum flexibility in order to facilitate rapid changes in the experimental setup. 0(3P), atoms are produced by the well-known reaction of nitrogen atoms with nitric oxide to yield 0(3P) and N2. The reactions occurring are chemiluminescent and the reaction of N-atoms with NO is 'titrated' so that the number of oxygen atoms produced can be calculated from the measured flow rate of NO at the stoichio-metric end-point of the reaction. With all of the NO exactly consumed, the gas stream contains only helium carrier gas, a known concentration of oxygen atoms, and chemically unreactive N2. By means of a suitable excitation and detection system, the resonance fluorescence of O(3P) is monitored. This continuous but relative measure of 0-atom concentration is then calibrated from the absolute value of the 0-atom concentra-tion, as previously described, to provide a continuous measure of the absolute concentration of atomic oxygen at any desired location in the system. Stress factors which can be applied include UV light (4000-2000 A at 50 suns intensity), temperature (ambient to 700 K), and electrical potential (0-5) kV).

Paper Details

Date Published: 6 April 1988
PDF: 4 pages
Proc. SPIE 0871, Space Structures, Power, and Power Conditioning, (6 April 1988); doi: 10.1117/12.943684
Show Author Affiliations
W. C. Neely, Auburn University (United States)
T. C. Yang, Auburn University (United States)
J. P. Wey, Auburn University (United States)
E. J. Clothiaux, Auburn University (United States)
S. D. Worley, Auburn University (United States)

Published in SPIE Proceedings Vol. 0871:
Space Structures, Power, and Power Conditioning
Raymond F. Askew, Editor(s)

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