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Effective operators in the atomic hyperfine interaction
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In this article, the many-body perturbation theory (MBPT) is applied to the atomic hyperfine interaction and the results are interpreted in terms of effective operators for systems with a single valence electron such as the alkali atoms.Abstract:
The many-body perturbation theory (MBPT) is reviewed and applied to the atomic hyperfine interaction. Graphical methods are introduced by without mathematical details. The results are interpreted in terms of effective operators. For systems with a single valence electron-such as the alkali atoms-this operator has the same form as the ordinary hyperfine operator and is identical to the operator commonly used in the analysis of experimental hyperfine data. The origin of different contributions to this operator is discussed. Numerical results are given for the 22S and 22P states of the lithium atom, where accurate MBPT calculations have recently been performed. For systems with several valence electrons additional parameters are needed or, alternatively, the parameters of the one-body effective operator are allowed to be term-dependent. Recent experiments and corresponding theoretical investigations on alkaline-earth elements, with two valence electrons, are reviewed and, in particular, MBPT calculations on the calcium atom are discussed.read more
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Regular Two-Component Pauli-Like Effective Hamiltonians in Dirac Theory
Ch Chang,M. Pelissier,Ph Durand +2 more
TL;DR: In this paper, it is shown that the theory of effective Hamiltonians allows the determination of Pauli-like Hamiltonians that are regular enough to be used in variational calculations.
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On the connectivity criteria in the open-shell coupled-cluster theory for general model spaces
TL;DR: In this article, the authors study the open-shell coupled-cluster theories and examine the current theoretical status regarding the existence or non-existence of a linked-clusters theorem, ensuring the connectedness of the cluster amplitudes and the effective Hamiltonian.
Journal ArticleDOI
Hyperfine-structure calculations in Xe II
Krzysztof Paduch,Jacek Bieron +1 more
TL;DR: In this paper, the multiconfiguration Dirac-Fock model is employed to compute the hyperfine interaction constants of the 5p4 5d 4 D7/2 levels of the xenon ion.
Journal ArticleDOI
Collinear laser spectroscopy of atomic cadmium
N. Frömmgen,Dimiter L. Balabanski,Mark Bissell,Jacek Bieron,Klaus Blaum,Bradley Cheal,Kieran Flanagan,Stephan Fritzsche,Stephan Fritzsche,Christopher Geppert,Christopher Geppert,M. Hammen,Magdalena Kowalska,K. Kreim,A. Krieger,A. Krieger,Rainer Neugart,Rainer Neugart,Gerda Neyens,M. Rajabali,Wilfried Nörtershäuser,Wilfried Nörtershäuser,J. Papuga,Deyan T. Yordanov,Deyan T. Yordanov,Deyan T. Yordanov +25 more
TL;DR: In this paper, the hyperfine structure anomaly for isotopes with s1/2 and d5/2 nuclear ground states and isomeric h11/2 states is evaluated and a linear relationship is observed for all nuclear states except s 1/2.
Journal ArticleDOI
Non-relativistic variational calculations of atomic properties in Li-like ions: Li I to O VI
TL;DR: In this article, the multiconfiguration Hartree-Fock method is used to calculate wavefunctions in the infinite nuclear mass limit for the terms 2s 2S, 2p 2Po, 3s 2 S, 3p 2 Po, 3d 2D and 4s 2 s of lithium-like ions (3≤Z≤8).
References
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Angular Momentum in Quantum Mechanics
TL;DR: In this paper, the angular momentum, one of the most fundamental quantities in all of quantum mechanics, is introduced and a concise introduction to its application in atomic, molecular, and nuclear physics is provided.
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Angular Momentum in Quantum Mechanics
TL;DR: In this article, the angular momentum, one of the most fundamental quantities in all of quantum mechanics, is introduced and a concise introduction to its application in atomic, molecular, and nuclear physics is provided.