|Author||Mahadevan, P. ♦ Layton, J. K. ♦ Comeaux, A. R. ♦ Medved, D. B.|
|Source||United States Department of Energy Office of Scientific and Technical Information|
|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)|
|Learning Resource Type||Article|
|Publisher Department||General Dynamics/Astronautics, San Diego, Calif.|
|Journal||Journal of Applied Physics|
|Organization||General Dynamics/Astronautics, San Diego, Calif.|
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