期刊
ASTROPHYSICAL JOURNAL
卷 934, 期 2, 页码 -出版社
IOP Publishing Ltd
DOI: 10.3847/1538-4357/ac7b85
关键词
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资金
- Strategic Key Research Program of the Chinese Academy of Sciences [XDB340 20000]
- National Key Research and Development Program of China [2017YFA0402400, 2017YFA0402300]
- NASA Astrophysics Research and Analysis (APRA) Program [NNH18ZDA001N]
- NASA Solar and Heliosphere Program [NNX13AF31G]
- U.S. Department of Energy [DE-AC0500OR22725]
Laboratory measurements of X-ray emissions from charge exchange between highly charged ions and neutrals reveal differences in state selectivity and emission between different target atoms and collision velocities. This suggests that accurate modeling of astrophysical charge exchange plasmas should consider target and velocity dependence.
Laboratory measurements of X-ray emissions following charge exchange (CX) between highly charged ions and neutrals are important to assess their diagnostic utility for the nonequilibrium astrophysical plasma environments, where hot flows meet cold gases. With a high-resolution X-ray quantum microcalorimeter detector, we report the CX-induced X-ray spectra and line ratios in Ne8+ on He and Kr collisions at solar wind velocities of 392, 554, 678, and 876 km s(-1), respectively. The experimentally determined line ratios quantify the differences in CX state selectivity and the following X-ray emission between He and Kr at different collision velocities. This suggests that target and velocity dependence should be considered for accurately modeling astrophysical CX plasmas.
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