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| v |
The 2p-3d and 2p-3s lines of Fe16+ - Fe23+
dominate the soft x-ray
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spectrum of many sources.
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| v |
Lines of different Fe-L ions have been measured to
high accuracy
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with LLNL EBIT and are easily discernible with
contemporary
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grating spectrometers.
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| v |
Even within the simplified coronal approximation,
Fe-L lines
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provide a powerful, robust tool for obtaining the
(abundance-free)
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temperature structure (EM) of the source.
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| v |
For years, Fe-L was deemed uncertain and considered
the nightmare
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and scapegoat of many x-ray astronomers. Unjustly
so!
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| v |
The 2p – 3s line powers need to be treated more
carefully.
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Where possible, it still makes a lot of sense to use
single-ion models
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independent of the ionization balance.
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| v |
Testing of the rates for transitions among excited
levels are
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encouraging.
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