Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011apj...742..130m&link_type=abstract
The Astrophysical Journal, Volume 742, Issue 2, article id. 130 (2011).
Astronomy and Astrophysics
Astronomy
1
Comets: General, Molecular Processes, Solar Wind
Scientific paper
Laboratory measurements of soft X-ray emissions from collisions between 36 keV O6+ ions and CO have been carried out with the aim of simulating emissions from comets interacting with the solar wind. Spectra in the range 62-155 eV are recorded and compared to results of the over-barrier model (OBM) and multichannel Landau-Zener (MLZ) calculations. Emissions from n = 3, 4 states of O5+ are observed. This is in good agreement with the OBM predictions of highest n-state for the electron capture. Line intensities for the n = 4 capture in simulated spectra using the semi-empirical MLZ approach, taking into account multielectron captures, are in very good agreement with experimental measurements. However, the OBM does not correctly account for direct feeding of the n = 3 levels for the CO target, though it does explain predominance of the n = 3 levels for an He target.
Chutjian Ara
Djuric Nada
Ehrenreich Thomas
Kessel Q. C.
Kharchenko Andriy V.
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