Cosmic ray interactions with lunar materials - Nature and composition of species formed

Computer Science

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Cosmic Rays, Lunar Soil, Lunar Surface, Particle Interactions, Absorption Spectra, Atmospheric Composition, Galactic Radiation, Ion Concentration, Lunar Atmosphere, Radiation Absorption, Recombination Reactions, Solar Cosmic Rays, Solar Wind

Scientific paper

The paper discusses the effect of cosmic-ray proton interactions with lunar material, the nature and composition of the species resulting from these interactions, and the contribution of these species to the lunar atmosphere. It is shown that hydrogen atoms resulting from cosmic-ray proton neutralization escape into the atmosphere mostly as H2, that only a small fraction of the very small amount of OH and H2O produced by cosmic-ray protons escapes into the atmosphere, and that cosmic-ray protons play a very minor role, as compared with solar-wind protons, in producing lunar atmospheric hydrogen and hydrogenated species. It is concluded that the atmospheric contributions of H2, H, OH, and H2O produced by cosmic-ray protons are about three orders of magnitude less than those due to solar-wind protons.

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