Abstract
The role of true collective effects in the 4d photoabsorption spectrum of Ba2+ is shown to be minor. The most significant departures from independent particle behavior are in fact due to correlations involving the 5p, not the 4d, shell; their importance is magnified by the delicate balance of opposing single-particle forces. Reevaluation of the ionization limit reveals the presence of Beutler–Fano structures in the experimental data, the first that have been observed for excitations underneath closed shells.
© 1984 Optical Society of America
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