Physics – Chemical Physics
Scientific paper
Jun 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jchph..86.6757v&link_type=abstract
Journal of Chemical Physics (ISSN 0021-9606), vol. 86, June 15, 1987, p. 6757-6765. Research supported by the Research Corp.
Physics
Chemical Physics
38
Born-Oppenheimer Approximation, Isotope Effect, Molecular Collisions, Nonadiabatic Conditions, Oxygen Isotopes, Schroedinger Equation, Chemical Equilibrium, Cosmochemistry, Eigenvectors, Electron States, Stratosphere
Scientific paper
The conditions under which nonadiabatic collisions should induce mass-independent isotopic fractionation are considered, and the consequences of such fractionation are discussed. It is shown that mass-independent isotopic fractionation in the UV photolysis of ozone is but one example of a general class of such fractionations that should be associated with nonadiabatic collisions. It is demonstrated that nonadiabatic effects may be the source of the equal O-17 and O-18 isotopic enrichment in meteoritic material observed by Clayton et al. (1973) as well as the equal O-17 and O-18 enrichments produced by Heidenreich and Thiemens using electrical discharges in oxygen-containing gas samples. The effect of oxygen isotopic fractionation in the UV photolysis of ozone on the isotope distributions among oxygen-containing species in the atmosphere is considered.
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