Evidence for O-atom exchange in the O(1D) + N2O reaction as the source of mass-independent isotopic fractionation in atmospheric N2O
Article first published online: 8 OCT 2004
Copyright 2004 by the American Geophysical Union.
Geophysical Research Letters
Volume 31, Issue 19, October 2004
How to Cite
2004), Evidence for O-atom exchange in the O(1D) + N2O reaction as the source of mass-independent isotopic fractionation in atmospheric N2O, Geophys. Res. Lett., 31, L19106, doi:10.1029/2004GL020950., , , , and (
- Issue published online: 8 OCT 2004
- Article first published online: 8 OCT 2004
- Manuscript Accepted: 31 AUG 2004
- Manuscript Revised: 21 AUG 2004
- Manuscript Received: 7 JUL 2004
 Recent experiments have shown that in the oxygen isotopic exchange reaction for O(1D) + CO2 the elastic channel is approximately 50% that of the inelastic channel [Perri et al., 2003]. We propose an analogous oxygen atom exchange reaction for the isoelectronic O(1D) + N2O system to explain the mass-independent isotopic fractionation (MIF) in atmospheric N2O. We apply quantum chemical methods to compute the energetics of the potential energy surfaces on which the O(1D) + N2O reaction occurs. Preliminary modeling results indicate that oxygen isotopic exchange via O(1D) + N2O can account for the MIF oxygen anomaly if the oxygen atom isotopic exchange rate is 30–50% that of the total rate for the reactive channels.