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The critical double-well in Ba + : many-body approach by the g-Hartree method
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In this paper, the g-Hartree method has been applied to the critical double-well problem in Ba+ and a significant improvement over earlier ab initio approaches is demonstrated and correlations are shown to have a large effect.Abstract:
A novel many-body approach, developed recently for atoms (the g-Hartree method), has been applied to the critical double-well problem in Ba+. A significant improvement over earlier ab initio approaches is demonstrated and correlations are shown to have a large effect. A correct choice of g leads to simultaneous agreement between theory and experiment for three different classes of data, namely, quantum defects, intensity variation and the spin-orbit splitting.read more
Citations
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The filling of shells in compressed atoms
TL;DR: In this paper, the energy spectra of ground-state, ionized and excited multielectron atoms and ions of the 3d and 4d periods of the periodic table centred in impenetrable spherical confinement are detailed using Hartree-Fock configuration average calculations.
Journal ArticleDOI
Collision-free multiple photon ionization of atoms and molecules at 193 nm.
TL;DR: The experimental evidence points to a coherent atomic motion involving several electrons, possibly an entire shell, as the main physical mechanism enabling the scale of energy transfers seen, a consideration that fundamentally distinguishes the nonlinear interaction of a multielectron atom from that of a single-electron system.
Journal ArticleDOI
Giant resonances in free atoms and in clusters
C Brechignac,J P Connerade +1 more
TL;DR: A review of recent developments in the study of giant resonances in free atoms and in clusters is presented, with particular emphasis on the transition from free atoms to atoms in the condensed phase.
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Controlling orbital collapse from inside and outside a transition element
TL;DR: In this article, a study of the bimodal behaviour of atomic wavefunctions for a transition element (Cr) and how this behaviour can be controlled and even turned into single-mode character either by varying the effective nuclear charge for nonintegral values, or placing the atom in a spherical cavity of adjustable radius.
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Orbital collapse in extended homologous sequences
TL;DR: In this article, the concept of a homologous sequence can be extended for this purpose, so that the plots embrace more elements than would otherwise be included, and that the most appropriate ordering within the sequence is not the one implied by the periodic table of the elements.
References
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Journal ArticleDOI
Theory of Spin-Orbit Coupling in Atoms. I. Derivation of the Spin-Orbit Coupling Constant
M. Blume,R. E. Watson +1 more
TL;DR: In this paper, an exact expression for the spin-orbit coupling constant was derived within the Hartree-Fock description of the atom by considering the two body mutual spinorbit interaction between electrons.
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Graphic Analysis of Perturbed Rydberg Series
TL;DR: In this paper, a method of analysis of all level positions in multiple strongly perturbed series of levels is presented and illustrated by examples from the rare gas and Ba spectra, which emphasizes the dependence of a perturbation on the periodicity of the perturbing series and aims at extracting significant information from experimental data in compact form.
Journal ArticleDOI
Resonant Photoemission in Barium and Cerium
Andrew Zangwill,Paul Soven +1 more
TL;DR: In this article, a theoretical discussion of resonant photoemission in barium and cerium is presented, using a time-dependent density-functional technique which both is accurate and provides a simple physical interpretation of the resonant phenomena.