期刊
ASTROPHYSICAL JOURNAL
卷 941, 期 2, 页码 -出版社
IOP Publishing Ltd
DOI: 10.3847/1538-4357/ac9c00
关键词
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资金
- European Union [871158]
- Max-Planck-Gesellschaft (MPG)
- NASA [80GSFC21M0002]
- NASA's astrophysics division
- Bundesministerium fuer Bildung und Forschung (BMBF) [05K13SJ2]
Metastable states of ions can be populated in astrophysical media for plasma-density diagnostics. Beryllium-like and carbon-like ions of neon and iron were experimentally investigated for their detectable features in soft X-ray absorption spectra.
Metastable states of ions can be sufficiently populated in absorbing and emitting astrophysical media, enabling spectroscopic plasma-density diagnostics. Long-lived states appear in many isoelectronic sequences with an even number of electrons, and can be fed at large rates by various photonic and electronic mechanisms. Here, we experimentally investigate beryllium-like and carbon-like ions of neon and iron that have been predicted to exhibit detectable features in astrophysical soft X-ray absorption spectra. An ion population generated and excited by electron impact is subjected to highly monochromatic X-rays from a synchrotron beamline, allowing us to identify K alpha transitions from metastable states. We compare their energies and natural line widths with state-of-the-art theory and benchmark level population calculations at electron densities of 10(10.5) cm(-3).
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