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The first optical absorption from excited states to autoionizing core-excited levels has been observed in lithium. A 1-MW dye laser tuned to the 1s²2s→1s²2p resonance produced {~}10¹⁶ excited atoms/cm² in a heat-pipe oven. Far-uv absorption spectra of Li*(2p) and Li⁺ were obtained. A curve of the evolution from excited neutrals to {~}95% ions is presented, and the significance of the Li observations for understanding the ionization mechanism is discussed.
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McIlrath et al. (1977) studied this question.
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