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Author Mahadevan, P. ♦ Layton, J. K. ♦ Comeaux, A. R. ♦ Medved, D. B.
Sponsorship USDOE
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PHYSICS ♦ ARGON ♦ ATOMS ♦ CHROMEL ♦ CHROMIUM ALLOYS ♦ CONSTANTAN ♦ COPPER ALLOYS ♦ ENERGY ♦ ENERGY RANGE ♦ IONS ♦ IRRADIATION ♦ LOSSES ♦ MEASURED VALUES ♦ METALS ♦ NEON ♦ NICKEL ALLOYS ♦ PLATINUM ♦ RARE GASES ♦ SURFACES ♦ THERMOELECTRIC CELLS ♦ THERMOELECTRICITY ♦ WIRES
Abstract Experiments using thermoelectric detectors for neutral particles showed differences in the energy transfer properties of noble-gas ions and neutral atoms. The focused and collimated beams of ions and atoms bombard a platium-receiving disk spot welded to the thermojunction, formed of Chromel and Constantan wires. Neutral atoms and ions of Ne and Ar were studied in the energy range 500 to 2500 ev. For ions, the fraction of the kinetic energy used to generate thermo-emf in the detector was observed to be independent of their incident kinetic energy. However, for the neutral atoms, the energy transfer coefficient was found to be a monotonically increasing function of kinetic energy always less than that for ions. No attempt was made to measure the absolute energy transfer coefficients. This discrepancy was qualitatively explained by the experimental observation that energetic neutral atoms are specularly reflected more than ions of the same species and kinetic energy from the platinum disk of the detector. (auth)
ISSN 00218979
Educational Use Research
Learning Resource Type Article
Publisher Date 1963-09-01
Publisher Department General Dynamics/Astronautics, San Diego, Calif.
Journal Journal of Applied Physics
Volume Number 34
Organization General Dynamics/Astronautics, San Diego, Calif.


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