Relativistic light-shift theory of few-electron systems: Heliumlike highly charged ions

O. Postavaru and A. C. Scafes
Phys. Rev. A 96, 033412 – Published 18 September 2017

Abstract

The light-shift theory of many-electron systems in a laser field is described using the projection operators technique. In heavy ions, the electrons are tightly bound by the Coulomb potential of the nucleus, which prohibits ionization even by strong lasers. However, interaction with the monofrequent laser field leads to dynamic shifts of the electronic energy levels, and the process is treated by second-order time-dependent perturbation theory. In order to treat heliumlike systems, one decomposes the corresponding matrix elements into hydrogenlike matrix elements using the independent particle model. We are applying a fully relativistic description of the electronic states by means of the Dirac equation. Our formalism goes beyond the Stark long-wavelength dipole approximation and takes into account nondipole effects of retardation and interaction with the magnetic field components of the laser beam.

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  • Received 13 January 2017

DOI:https://doi.org/10.1103/PhysRevA.96.033412

©2017 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

O. Postavaru1,* and A. C. Scafes2,†

  • 1Faculty of Mathematics and Computer Science, University of Bucharest, Str. Academiei 14, 010014, Bucharest, Romania
  • 2Horia Hulubei National Institute of Physics and Nuclear Engineering, P.O. Box MG-6, 077125, Magurele, Romania

  • *opostavaru@linuxmail.org
  • ascafes@tandem.nipne.ro

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Vol. 96, Iss. 3 — September 2017

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