Reduced titanium in lunar regolith

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Lunar Rocks, Photoelectrons, Spectroscopic Analysis, Titanium, Atomic Energy Levels, Atomic Structure, Iron, Lunik 16 Lunar Probe

Scientific paper

Photoelectron spectroscopy was used to investigate characteristics of 2p electrons of titanium in samples of lunar regolith obtained by Luna-16. The photoelectron spectra obtained for the lunar regolith titanium were compared with those obtained for metallic titanium and for a variety of titanates and titanosilicates with known crystal structures. The quantity and distribution of reduced forms of titanium and iron indicate that intense reduction processes occur on the surface of lunar regolith particles. It is speculated that the observed distribution of reduced forms could result from selective volatilization and condensation, leading to the formation of metallic clusters in a silicate matrix. However, in consideration of the insignificant depth of the reduced layer and the similarity of signal extinction from iron and titanium, reducing action of cosmic rays cannot be ruled out.

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