Systematic variation of the electron-beam energy in the EBIT-II electron beam ion trap has been employed to produce soft-x-ray spectra (20--75 ) of Kr with well-defined maximum charge states ranging from Cu- to Al-like ions. Guided by large-scale relativistic atomic structure calculations, the strongest lines have been identified with Δn=1 $(n=3$ to n^'=4) transitions from Ni- to P-like ions (Kr⁸⁺-Kr²¹⁺), as well as a number of 3p-4d and 3d-5f transitions.
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Chen et al. (2002) studied this question.
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