State-Selective Charge Transfer Cross Sections for Sulfur Ion Collisions with H2 for Jovian X-ray Emission Modeling

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6220 Jupiter, 7554 X Rays, Gamma Rays, And Neutrinos, 7831 Laboratory Studies

Scientific paper

Using a combination of theoretical and experimental data and analytical scaling relations, we present a recommended set of state-selective and total charge transfer cross sections for collisions of Sq+ (q=1-16) with H2 for energies between ~10 eV/u and 1 MeV/u. The cross sections are based on new theoretical results computed with an improved classical trajectory Monte Carlo (CTMC) model and the multichannel Landau-Zener approximation. The existing experimental data is sparse, but is incorporated where available. Results are presented for all important charge transfer processes including single electron capture, double electron capture, double electron capture followed by autoionization, and transfer ionization. Inclusion of this data in new Jovian x-ray emission models may account for the observed x-ray flux between 300-500 eV missing in previous models which considered only oxygen ions.

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