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. 1985:15:299-318.
doi: 10.1007/BF01808175.

The photochemistry of biogenic gases in the early and present atmosphere

J S Levine  1 , T R Augustsson
Affiliations

The photochemistry of biogenic gases in the early and present atmosphere

J S Levine et al. Orig Life Evol Biosph. 1985.

Abstract

NASA: A photochemical model of biogenic gases in the paleoatmosphere is presented. Gases used include methane, ammonia, and hydrogen sulfide. Background atmospheric composition included nitrogen, water vapor, carbon dioxide, molecular hydrogen, carbon monoxide, and sulfur dioxide. Thermodynamic equilibrium calculations are reviewed for methane, ammonia, carbon monoxide, and nitrous oxide. The photochemistry of hydrogen sulfide is reviewed. It is concluded that presence of methane, ammonia, and hydrogen sulfide in the prebiological atmosphere was very short-lived and in small amounts.

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