Other
Scientific paper
Jun 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976natur.261..666n&link_type=abstract
Nature, vol. 261, June 24, 1976, p. 666-669.
Other
4
Lunar Rocks, Vacuum Melting, Vaporizing, Volatility, Basalt, Mathematical Models, Oxygen, Reaction Kinetics
Scientific paper
It has been observed that a high-temperature melt placed in a vacuum chamber with 'cool' walls displays persistent plateaus in the concentration of volatile components, in contrast with the complete evaporation of volatile components expected in a nonequilibrium open system. The heights of the plateaus depend on the pressures in the chamber, which are in a range too low to cause return of the volatile molecules to melt. A mathematical investigation of the volatilization process is presented. It is shown that the concentration plateaus may be explained if molecules of volatile substances reaching the surface of the melt enter a nonvolatile state through oxidation by oxygen adsorbed on the surface from residual gas. This model is applicable to the volatilization of elements from the melts of lunar materials in a fairly thin layer, where transport processes can be neglected. It provides a possible mechanism for the dissapearance of oxygen and other active gases from the atmosphere of the moon and planets.
Cherniak Iu. B.
Nusinov M. D.
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