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Triple excitation in relativistic coupled-cluster theory and properties of one-valence systems Rb and Sr$^+$

We examine the contributions from triple excitation cluster operators in the relativistic coupled-cluster theory in atoms and ions. For this, we propose a tensor representation of the triple cluster operator. Based on this representaion and using diagrammatic analysis, we derive the linearized coupled-cluster equations for single, double and triple excitation cluster operators. The contributions from the triple cluster operators to the hyper fine structure constants of single-valence systems Rb and Sr$^+$ are analysed using the perturbed triples.

preprint2011arXivOpen access
B. K. ManiDilip Angom
physics.atom-ph
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B. K. ManiDilip Angom

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