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The photolytic degradation and oxidation of organic compounds under simulated Martian conditions.

Abstract：

:Cosmochemical considerations suggest various potential sources for the accumulation of organic matter on Mars. However the Viking Molecular Analysis did not indicate any indigenous organic compounds on the surface of Mars. Their disappearance from the top layer is most likely caused by the combined action of the high solar radiation flux and various oxidizing species in the substances and a sample of the Murchison meteorite was tested under simulated Martian conditions. After adsorption on powdered quartz, samples of adenine, glycine and naphthalene were irradiated with UV light at various oxygen concentrations and exposure times. In the absence of oxygen, adenine and glycine appeared stable over the given irradiation period, whereas a definite loss was observed in the case of naphthalene, as well as in the volatilizable and pyrozable content of the Murchison meteroite. The presence of oxygen during UV exposure caused a significant increase in the degradation rate of all samples. It is likely that similar processes have led to the destruction of organic materials on the surface of Mars.

journal_name

J Mol Evol

journal_title

Journal of molecular evolution

authors

Oró J,Holzer G

doi

10.1007/BF01732374

subject

Has Abstract

pub_date

1979-12-01 00:00:00

pages

153-60

issue

1-3

eissn

0022-2844

issn

1432-1432

journal_volume

14

pub_type

杂志文章

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