Physics
Scientific paper
Apr 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000sursc.451..160y&link_type=abstract
Surf. Sci., Vol. 451, No. 1 - 3, p. 160 - 165
Physics
12
Moon Atmosphere: Sodium
Scientific paper
The authors have studied the desorption induced by electronic transitions (DIET) of Na adsorbed on model mineral surfaces, i.e. amorphous, stoichiometric SiO2 films. They find that electron stimulated desorption (ESD) of atomic Na occurs for electron energy thresholds as low as ≡4 eV, that desorption cross-sections are high (≡1×10-19cm2 at 11 eV), and that desorbing atoms are 'hot', with suprathermal velocities. The estimated Na desorption rate from the lunar surface via ESD by solar wind electrons is a small fraction of the rate needed to sustain the Na atmosphere. However, the solar photon flux at energies ≥5 eV exceeds the solar wind electron flux by orders of magnitude; there are sufficient ultraviolet photons incident on the lunar surface to contribute substantially to the lunar Na atmosphere via PSD of Na from the surface.
Madey Theodore E.
Yakshinskiy Boris V.
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