Physics
Scientific paper
Oct 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979e%26psl..45..133g&link_type=abstract
Earth and Planetary Science Letters, vol. 45, no. 1, Oct. 1979, p. 133-140.
Physics
1
Charge Exchange, Electric Potential, Electron Bombardment, Lunar Soil, Secondary Emission, Beam Currents, Electron Beams, Electrostatics, Experiment Design, Graphs (Charts), Insulators, Moon, Samples, Lunar, Soils, Electrons, Emissions, Experiments, Electrostatic Transport, Equipment, Data, Core Tube Samples, Electric Fields, Grains, Spectrometer, Concentrations, Chemistry, Sputtering, 10084, 61500, 60009, 15005
Scientific paper
A procedure is described for the determination of the 'apparent crossover voltage', i.e. the value of the primary (bombarding) electron energy at which an insulating sample surface changes the average sign of its charge. This apparent crossover point is characteristic of the secondary emission properties of insulating powders such as the lunar soil samples. Lunar core samples from well-defined, distinct soil layers are found to differ significantly in their secondary emission properties. This observation supports the suggestion that soil layers were deposited by an electrostatic transport process.
Baron Richard L.
Bilson Elizabeth
Gold Thomas
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