Measurements of the reaction rates of O/++/ ions with N2 and O2 at thermal energy and their ionospheric implications

Details Measurements of the reaction rates of O/++/ ions with N2 and O2 at thermal energy and their ionospheric implications Measurements of the reaction rates of O/++/ ions with N2 and O2 at thermal energy and their ionospheric implications

Oct 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978georl...5..847j&link_type=abstract

Geophysical Research Letters, vol. 5, Oct. 1978, p. 847, 848.

Physics

9

Atmospheric Chemistry, Ionospheric Composition, Nitrogen, Oxygen, Reaction Kinetics, Cations, Charge Exchange, Explorer 55 Satellite, Mass Spectrometers, Oxygen Ions, Satellite Observation

Scientific paper

A drift-tube mass-spectrometer apparatus has been used to determine the rate coefficients for the loss of O(++) ions by charge transfer on collisions with N2 and O2 molecules. At 300 K the respective coefficients are (1.3 + or - 0.3) x 10 to the -9th power and (1.5 + or - 0.3) x 10 to the -9th power cu cm/sec. Even at F-region temperatures these reactions should be fast, since the rate coefficients for reactions of this type vary only slightly with increase in temperature. However, in the recent model calculations of Breig et al. (1977) the AE measurements of the O(++) altitude profiles are only reproduced if the O(++) + N2 rate coefficient is assumed to be much smaller than 10 to the -10th power cu cm/sec. Thus it is concluded that important sources of O(++) ions have been omitted from the model.

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