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Observation of an ‘atomic plasmon’ resonance in the Ba I absorption spectrum between 10 and 200 Å

The observation of a broad ‘atomic plasmon’ resonance, recently predicted by Wendin is reported, together with a number of discrete features due to excitation of a single electron from the 4d subshell in Ba I. HartreeFock calculations indicate mixing between configurations built on 4d9 5p6 6s2, 4d9 5p6 5d 6s and 4d9 5p6 5d2 of Ba II. Discrepancies between Wendin’s theory and experiment are attributed to this mixing. The spectrum near 16 Å arising by excitation of the 3d subshell has also been observed.