Electron spectroscopic studies related to solar-wind darkening of the lunar surface

Details Electron spectroscopic studies related to solar-wind darkening of the lunar surface Electron spectroscopic studies related to solar-wind darkening of the lunar surface

Jan 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975georl...2...33y&link_type=abstract

Geophysical Research Letters, vol. 2, Jan. 1975, p. 33-36. Research supported by the University of Maryland;

Physics

5

Darkening, Iron, Lunar Surface, Solar Wind, X Ray Spectroscopy, Electrophotometry, Fines, Ion Impact, Lunar Soil, Photoelectrons, Proton Flux Density, Valence

Scientific paper

Improved instrumentation in the X-ray photoelectron spectrometer allowed the first direct observation of the change of valence state of iron in the silicate Fayalite under helium-ion bombardment. From the observed ion dosage necessary to reduce the iron in the topmost atomic layers to the metallic state it is estimated that similar reduction on the lunar surface under solar-wind proton bombardment would occur between 700 to 1000 years. Within such a time scale, it seems likely that all surface iron in the iron-containing lunar fines should have been reduced to the metallic state. Implications of these experimental observations in terms of various proposed darkening mechanisms are discussed.

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