Absolute single and multiple charge exchange cross sections for highly charged C, O, and Ne ions on H2O , CO, and CO2

Details Absolute single and multiple charge exchange cross sections for highly charged C, O, and Ne ions on H2O , CO, and CO2 Absolute single and multiple charge exchange cross sections for highly charged C, O, and Ne ions on H2O , CO, and CO2

Mar 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007phrva..75c2704m&link_type=abstract

Physical Review A, vol. 75, Issue 3, id. 032704

Physics

15

Electronic Excitation And Ionization Of Molecules, Intermediate Molecular States, Ion-Molecule, Ion-Ion, And Charge-Transfer Reactions, Particle Emission, Solar Wind

Scientific paper

Reported herein are measured absolute single, double, and triple charge exchange (CE) cross sections for the highly charged ions (HCIs) Cq+ (q=5,6) , Oq+ (q=6,7,8) , and Neq+ (q=7,8) colliding with the molecular species H2O , CO, and CO2 . Present data can be applied to interpreting observations of x-ray emissions from comets as they interact with the solar wind. As such, the ion impact energies of 7.0qkeV (1.62-3.06keV/amu) are representative of the fast solar wind, and data at 1.5qkeV for O6+ (0.56keV/amu) on CO and CO2 and 3.5qkeV for O5+ (1.09keV/amu) on CO provide checks of the energy dependence of the cross sections at intermediate and typical slow solar wind velocities. The HCIs are generated within a 14GHz electron cyclotron resonance ion source. Absolute CE measurements are made using a retarding potential energy analyzer, with measurement of the target gas cell pressure and incident and final ion currents. Trends in the cross sections are discussed in light of the classical overbarrier model (OBM), extended OBM, and with recent results of the classical trajectory Monte Carlo theory.

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