Biology
Scientific paper
Dec 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jmole..14...79z&link_type=abstract
Journal of Molecular Evolution, vol. 14, Dec. 1979, p. 79-89.
Biology
1
Mars, Environment, Exobiology, Oxidation, Ultraviolet, Spectrum, Data, Wavelengths, Simulations, Experiments, Photochemistry, Chemistry, Comparisons, Irradiation, Temperatures, Procedure, Samples, Diagrams
Scientific paper
A facility was established for long-duration ultraviolet (UV) radiation exposure of natural and synthetic materials in order to test hypotheses concerning Martian soil chemistry observed by the Viking Mars landers. The system utilized a 2500 watt xenon lamp as the radiation source, with the beam passing through a heat-dissipating water filter before impinging upon an exposure chamber containing the samples to be irradiated. The chamber was designed to allow for continuous tumbling of the samples, maintenance of temperatures below 0 C during exposure, and monitoring of beam intensity. The facility also provided for sample preparation under a variety of atmospheric conditions, in addition to the Mars nominal. As many as 33 sealed sample ampules have been irradiated in a single exposure. Over 100 samples have been irradiated for approximately 100 to 700 h. The facility has performed well in providing continuous UV irradiation of multiple samples for long periods of time under simulated Mars atmospheric and thermal conditions.
Devincenzi Donald L.
Mack Ruth
Zill L. P.
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