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Spatially resolved Fe Kα spectra in the wavelength range of 1.7–2.0 Å (FeII-XXVI) and 1.91–1.95 Å (FeII-XIX) are first observed in a single shot with low-resolution Johansson and high-resolution Johann type crystal spectrometers, respectively. The spectra show the evident proof that the vacuum spark plasma has two different structures. One is a thermalized point plasma (≲10 μm) with high temperature (Te ∼2 keV) and high density (ne ∼1021 cm−3). The spectrum contains x-ray lines from FeXXIII-XXVI. The other is an extended plasma (∼3 mm) associated with nonthermal electrons, where the region of intense emission of Kα lines from FeIII-XX shifts toward the cathode with the increase of the ionic charge.
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Morita et al. (1983) studied this question.
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