Numerous new resonances of triply photoexcited hollow Li atoms have been found above the 2s²2p²Pᵒ resonance at 142.3 eV. The main features are reproduced by multiconfiguration Dirac-Fock calculations. The spectrum lacks regular series structure and the pattern is found to manifest the effect of the hollow atomic nature of triply excited states. Fano parameters for the 2s²2p²Pᵒ resonance were obtained. One-step double autoionization was observed for the first time in the decay from this resonance.
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Azuma et al. (1995) studied this question.
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