Rare gases on planets

Details Rare gases on planets Rare gases on planets

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991prir........75s&link_type=abstract

Priroda (ISSN 0032-874X), Feb. 1991, p. 75-81. In Russian.

Physics

Gas Density, Planetary Atmospheres, Rare Gases, Terrestrial Planets, Atomic Weights, Planetary Nebulae, Planetary Orbits, Protoplanets

Scientific paper

Abundances of rare gases on different planets are considered and differences in their concentrations are analyzed. It is shown that there is a regularity in the fractionation coefficients of rare gases that can be characterized by two laws of rare-gas abundances on the terrestrial planets. They are formulated as following: (1) the logarithm of fractionation coefficient of two gases on a planet is inversely proportional to the atomic mass ratio of these gases; (2) the logarithm of the fractionation coefficient of any two rare gases on a planet is an exponential function of the inverse of its orbit radius. The major fractionation mechanism of rare gases is their adsorption on solid particles in the protoplanetary nebula. This finding can clarify differences in concentration ratios of rare gases, e.g., Xe-130/Ar-36 and Ar-36/Ne-20.

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