Physics
Scientific paper
May 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000jgr...10510631s&link_type=abstract
Journal of Geophysical Research, Volume 105, Issue A5, p. 10631-10636
Physics
8
Atmospheric Composition And Structure: Ion Chemistry Of The Atmosphere, Ionosphere: Modeling And Forecasting, Ionosphere: Particle Precipitation, Magnetospheric Physics: Energetic Particles, Precipitating
Scientific paper
We report measurements of the absolute differential cross sections for charge-transfer scattering of 0.5-, 0.85-, 1.5-, 2.8-, and 5-keVO+ ions by O2 at scattering angles between 0.04° and 5.4° in the laboratory frame. Cross sections for both O+(4S) ground-state and O+(2D,2P) metastable ions are presented. The metastable differential cross section is somewhat more forward peaked than that for the ground state. Integral and total cross sections are also reported. The present O+(4S) cross section is consistent with previous measurements, but the present metastable-state cross section is found to be substantially lower than previously reported in this energy range. These measurements provide information relevant to model calculations of O+ precipitation into the upper atmosphere during geomagnetic storms.
Lindsay Bruce G.
Merrill Robert L.
Sieglaff D. R.
Smith Anna K.
Stebbings R. F.
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