Resonance lines originating from autoionization energy levels far above the ionization potential have been observed for highly ionized atoms from Ti to Cu. Two of the lines for each ion have been classified as the transitions 2s2 2p6 3s ²S12−2s2 2p5 3s2 ²P032,12 of the Na i isoelectronic sequence. Wavelength and energy tables are given and a typical spectrogram is presented.
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Feldman et al. (1967) studied this question.
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