For the first time an optical transition between bound states in a negative ion of an atom has been established experimentally. The transition at 3490 AA is observed after beam-foil excitation. By applying an electric field it is shown to belong to the Li - spectrum. According to Bunge (1980) it connects two core-excited quintet states in the negative lithium ion.
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Mannervik et al. (1980) studied this question.
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