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Energy levels of the krypton atom in the range 23-28 eV have been observed using low-energy electron impact excitation and ejected-electron spectroscopy. The levels observed belong to the configurations 4s4p 6 ns, 4s4p 6 np, 4s4p 6 nd and 4s 2 4p 4 nln'l'. Those of the former kind have been identified but an analysis of the doubly excited levels has not been possible. The 1 S and 3 S terms of the 4s4p 6 5s configuration have been studied in detail in order to determine their energies, their widths and the behaviour of their shape parameters as a function of incident energy, angle of ejection and final ion state.
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Baxter et al. (1982) studied this question.
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