Absolute measurements and theoretical calculations of photoionization cross sections along the isonuclear sequence of multiply charged barium ions

Photoionization of multiply charged ions of the Ba isonuclear sequence up to Ba6+ has been studied in a beam-beam experiment. A very strong increase in the resonance structures was observed when moving from Ba2+ to Ba6+. Absolute values of the photoionization cross sections were measured for Ba2+ an...

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Published in:Physical review letters 2001-12, Vol.87 (27 Pt 1), p.273002-273002, Article 273002
Main Authors: Bizau, J M, Cubaynes, D, Esteva, J M, Wuilleumier, F J, Blancard, C, Bruneau, J, Champeaux, J P, Compant La Fontaine, A, Couillaud, C, Marmoret, R, Rémond, C, Hitz, D, Delaunay, M, Haque, N, Deshmukh, P C, Zhou, H L, Manson, S T
Format: Article
Language:English
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Summary:Photoionization of multiply charged ions of the Ba isonuclear sequence up to Ba6+ has been studied in a beam-beam experiment. A very strong increase in the resonance structures was observed when moving from Ba2+ to Ba6+. Absolute values of the photoionization cross sections were measured for Ba2+ and Ba3+ ions. The interpretation of the results is provided using theoretical multiconfiguration Dirac-Fock and relativistic random phase approximation calculations, showing that the collapse of the nf orbitals occurs for Ba4+.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.87.273002