Journal
SCIENCE
Volume 321, Issue 5894, Pages 1328-1331Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1159178
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Funding
- NASA [NNX07AJ81G]
- Office of Energy Research, Office of Basic Energy Sciences, Chemical Sciences Division of the U. S. Department of Energy [DE-AC02-05CH11231]
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Self- shielding of carbon monoxide ( CO) within the nebular disk has been proposed as the source of isotopically anomalous oxygen in the solar reservoir and the source of meteoritic oxygen isotopic compositions. A series of CO photodissociation experiments at the Advanced Light Source show that vacuum ultraviolet ( VUV) photodissociation of CO produces large wavelength- dependent isotopic fractionation. An anomalously enriched atomic oxygen reservoir can thus be generated through CO photodissociation without self- shielding. In the presence of optical self- shielding of VUV light, the fractionation associated with CO dissociation dominates over self- shielding. These results indicate the potential role of photochemistry in early solar system formation and may help in the understanding of oxygen isotopic variations in Genesis solar- wind samples.
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