The O+(4S)+N2(X1Σg+)-- >NO+(X1Σ+)+N(4S) reaction as a source of highly rotationally excited NO+ in the thermosphere

Details The O+(4S)+N2(X1Σg+)-- >NO+(X1Σ+)+N(4S) reaction as a source of highly rotationally excited NO+ in the thermosphere The O+(4S)+N2(X1Σg+)-- >NO+(X1Σ+)+N(4S) reaction as a source of highly rotationally excited NO+ in the thermosphere

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000jastp..62.1199d&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 62, Issue 13, p. 1199-1206.

Physics

5

Scientific paper

Observations of daytime NO+ radiance near 4.3μm by the Cryogenic Infrared Radiance Instrumentation for Shuttle (CIRRIS 1A) indicate that NO+ rotation is in non-local thermodynamic equilibrium (NLTE). The present work investigates the possibility of the nonthermal O++N2 reaction as a source of rotational NLTE NO+ emission using standard chemical dynamics techniques. Calculations have been performed to determine the reaction cross section and the final NO+ vibrational-rotational distributions of the O++N2 reaction as a function of initial translational energy. The potential energy surface was constructed based upon limited, reliable ab initio information. The calculated reaction cross section, which shows a very strong translational energy dependence, is in agreement with the available experimental data. The calculations also indicate that vibrational excitation of N2 is as efficient as initial translational energy in promoting reaction, again in agreement with experimental evidence. The calculated average final translation energy is consistent with experiment for energies below 2 eV, indicating that the NO+ internal energy is well characterized by the calculations. The results indicate that the NO+ product from nonthermal collisions is vibrationally cold with substantial rotational excitation consistent with recent analyses of Earthlimb spectra.

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