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Mechanisms and observations for isotope fractionation of molecular species in planetary atmospheresChemcial and physical processes which may give rise to isotope fractionation of molecular species in the atmospheres of both earth and other planets are reviewed, along with observations of isotopically substituted molecules in planetary atmospheres. Mechanisms for production of isotope fractionation considered include atmospheric escape and the effect of isotope substitution on equilibrium constants (including those of phase changes), photolysis rates, and chemical reaction rates. The isotopes considered for compounds in the terrestrial atmosphere include D, T, C-13, C-14, N-15, O-18, and S-34. Compounds for which data about isotopic composition in the terrestrial atmosphere are summarized include CO, CO2, O3, N2O, NH3, SO2, H2S, H2O, H, H2, and CH4. Planetary atmospheres discussed include those of Venus, Mars, Jupiter, Saturn, Uranus, and Titan; isotopes reviewed are D, C-13, N-15, and O-18. Suggestions for additional research in the area of isotopically substituted molecules in atmospheres are offered.
Document ID
19880033686
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Kaye, Jack A.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 13, 2013
Publication Date
November 1, 1987
Publication Information
Publication: Reviews of Geophysics
Volume: 25
ISSN: 8755-1209
Subject Category
Lunar And Planetary Exploration
Report/Patent Number
ISSN: 8755-1209
Accession Number
88A20913
Distribution Limits
Public
Copyright
Other

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