Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008phdt........13m&link_type=abstract
Proquest Dissertations And Theses 2008. Section 0056, Part 0606 128 pages; [Ph.D. dissertation].United States -- Connecticut: U
Astronomy and Astrophysics
Astrophysics
1
Physics, Optical Spectra, Atomic/Molecular Physics, Comets, X-Ray Spectra, Astrophysics, Solar Wind Ions, Cometary Gas
Scientific paper
In 1996 the ROSAT satellite detected x-ray emissions from the atmosphere of comet Hyukatake [1]. Since then Cravens [2] explained these emissions as being the result of highly-charged heavy solar wind ions colliding with cometary gas molecules and undergoing charge-exchange interactions. Electrons are captured by the incoming ions into excited states. The consequent decays result in photon emission in the x-ray/vuv range. To study these reactions, ion beams are created in the laboratory and passed through CO, an important constituent gas of comet atmospheres. The resulting emissions are studied both the x-ray/vuv (1-70 nm) and the optical (400-800 nm) ranges. Ion beams of different charge states of O, N, C, S, Fe, and Si were used. The data shows that the dominant reaction creating the x-ray emissions is single electron capture and agrees very well with the predictions of the Classical Over-the-Barrier Model [3]. The dominant reaction creating optical emissions is target ionization and excitation, and single electron capture may play an important role here, too.
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