Cammi R, Rahm M, Hoffmann R, Ashcroft NW. Varying Electronic Configurations in Compressed Atoms: From the Role of the Spatial Extension of Atomic Orbitals to the Change of Electronic Configuration as an Isobaric Transformation.
J Chem Theory Comput 2020;
16:5047-5056. [PMID:
32551592 PMCID:
PMC8008388 DOI:
10.1021/acs.jctc.0c00443]
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Abstract
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A quantum
chemical model for the study of the electronic structure
of compressed atoms lends itself to a perturbation-theoretic analysis.
It is shown, both analytically and numerically, that the increase
of the electronic energy with increasing compression depends on the
electronic configuration, as a result of the variable spatial extent
of the atomic orbitals involved. The different destabilization of
the electronic states may lead to an isobaric change of the ground-state
electronic configuration, and the same first-order model paves the
way to a simple thermodynamical interpretation of this process.
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