Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008apj...679.1661d&link_type=abstract
The Astrophysical Journal, Volume 679, Issue 2, pp. 1661-1664.
Astronomy and Astrophysics
Astronomy
6
Atomic Data, Comets: General, Sun: Solar Wind
Scientific paper
Absolute charge exchange (CE) cross sections have been measured for single and multiple exchanges between the highly charged ions (HCIs) Cq+ (q=3-6), Nq+ (q=4-7) and Oq+ (q=5-7) colliding with the target methane (CH4) present in comet and planetary atmospheres. Measurements were made at collision energies of 7×q keV (1.8-3.5 keV amu-1), representative of the fast component of the solar wind. The HCIs are produced in a 14 GHz electron cyclotron resonance ion source. Absolute cross sections are measured using the retarding potential analyzer method, with knowledge of the target length, density, and projectile currents. Comparison is made with results of the classical trajectory Monte Carlo method, and the classical overbarrier model.
Chutjian Ara
Djuric Nada
Simcic Juri
Smith Stephen J.
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