Production Of Ground State Atomic Oxygen In A Multifactor Stress Environment

W. C. Neely; T. C. Yang; J. P. Wey; E. J. Clothiaux; S. D. Worley

doi:10.1117/12.943684

6 April 1988 Production Of Ground State Atomic Oxygen In A Multifactor Stress Environment

W. C. Neely, T. C. Yang, J. P. Wey, E. J. Clothiaux, S. D. Worley

Proceedings Volume 0871, Space Structures, Power, and Power Conditioning; (1988) https://doi.org/10.1117/12.943684
Event: 1988 Los Angeles Symposium: O-E/LASE '88, 1988, Los Angeles, CA, United States

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).

Citation Download Citation

W. C. Neely, T. C. Yang, J. P. Wey, E. J. Clothiaux, and S. D. Worley "Production Of Ground State Atomic Oxygen In A Multifactor Stress Environment", Proc. SPIE 0871, Space Structures, Power, and Power Conditioning, (6 April 1988); https://doi.org/10.1117/12.943684

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