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The 4d relative photoabsorption cross section of cesium has been observed to change dramatically in appearance along the isonuclear sequence Cs through Cs4+. In each case, discrete structure is observed below threshold and for Cs through Cs2+, a giant dipole 4d→ɛf resonance is also present above threshold. Between Cs2+ and Cs3+, there is a striking change, with much of the oscillator strength available in the 4d→f channel being abruptly transferred to the discrete spectrum. Despite the complexity of the transitions involved, the oscillator strength envelope for the discrete transitions yields relatively few features and remains essentially static in energy regardless of the parent terms. Hartree-Fock with configuration interaction and time-dependent local-density-approximation calculations successfully account for this behavior and permit identification of the discrete features

physical review a

Wave-function collapse with increasing ionization: <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>4</mml:mn><mml:mi>d</mml:mi></mml:math>photoabsorption of Cs through<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">Cs</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>

Wave-function collapse with increasing ionization: 4dphotoabsorption of Cs throughCs4+