Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa13a1884g&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SA13A-1884
Physics
[0335] Atmospheric Composition And Structure / Ion Chemistry Of The Atmosphere, [0343] Atmospheric Composition And Structure / Planetary Atmospheres, [2459] Ionosphere / Planetary Ionospheres, [6225] Planetary Sciences: Solar System Objects / Mars
Scientific paper
Dissociative recombination (DR) of N2+, N2+ + e- → N + N, is a source of hot N at Mars and where it plays a central role in atmospheric escape and isotope fractionation (Fox and Hać, 1997). Theoretical quantum chemical calculations are reported for the DR and vibrational relaxation of the lowest 5 vibrational levels of the N2+ electronic ground state. Of the 109 states that arise from the atomic valence states, the 3Πu states are the dominant routes. The calculations take into account direct DR via several dissociative routes, indirect DR involving intermediate Rydberg states having both the ion ground state and the A2Πu state as core, and interference between the direct and indirect DR processes. For the ion ground state, the total calculated rate constant from v=0 is 2.2 x (Te/300)-0.20 x 10-7cm3/sec for 100 K< Te < 400 K where Te is the electron temperature. The calculated rate constant is in excellent agreement with many vibrational ground state experimental measurements. There have been no prior theoretical determinations of the rate constant and no prior experimentally derived rate constants for v>0. The results indicate that a storage ring measurement of the DR rate coefficient for v=0 was actually a measurement involving an ion in a vibrational population inversion. Reference: J. L. Fox and A. Hać, J. Geophys. Res. 102, 9191 (1997).
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