Research output: Contribution to journal › Article › peer-review
QED calculation of electron-electron correlation effects in heliumlike ions. / Kozhedub, Y. S.; Malyshev, A.; Glazov, D. A.; Shabaev, V. M.; Tupitsyn, I. I.
In: Physical Review A, Vol. 100, No. 6, 062506, 10.12.2019.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - QED calculation of electron-electron correlation effects in heliumlike ions
AU - Kozhedub, Y. S.
AU - Malyshev, A.
AU - Glazov, D. A.
AU - Shabaev, V. M.
AU - Tupitsyn, I. I.
PY - 2019/12/10
Y1 - 2019/12/10
N2 - A fully relativistic approach to evaluating the correlation effects in highly charged ions is presented. The interelectronic-interaction contributions of first and second orders in 1/Z are treated rigorously within the framework of bound-state quantum electrodynamics, whereas the calculations of the third- and higher-order contributions are based on the Dirac-Coulomb-Breit Hamiltonian. The developed approach allows one to deal with single as well as degenerate or quasidegenerate states. We apply this approach to the calculations of the correlation contributions to the n = 1 and n = 2 energy levels in helium like ions. The obtained contributions are combined with the one-electron QED, screened QED, nuclear recoil, and nuclear polarization corrections to get the total theoretical predictions for the ionization and transition energies in high-Z helium like ions.
AB - A fully relativistic approach to evaluating the correlation effects in highly charged ions is presented. The interelectronic-interaction contributions of first and second orders in 1/Z are treated rigorously within the framework of bound-state quantum electrodynamics, whereas the calculations of the third- and higher-order contributions are based on the Dirac-Coulomb-Breit Hamiltonian. The developed approach allows one to deal with single as well as degenerate or quasidegenerate states. We apply this approach to the calculations of the correlation contributions to the n = 1 and n = 2 energy levels in helium like ions. The obtained contributions are combined with the one-electron QED, screened QED, nuclear recoil, and nuclear polarization corrections to get the total theoretical predictions for the ionization and transition energies in high-Z helium like ions.
KW - CONFIGURATION-INTERACTION CALCULATIONS
KW - LAMB-SHIFT
KW - NUCLEAR-POLARIZATION
KW - GROUND-STATE
KW - ISOELECTRONIC SEQUENCE
KW - PERTURBATION-THEORY
KW - FORTRAN PROGRAM
KW - EXCITED-STATES
KW - TRIPLET-STATES
KW - HEAVY-IONS
U2 - 10.1103/PhysRevA.100.062506
DO - 10.1103/PhysRevA.100.062506
M3 - статья
VL - 100
JO - Physical Review A - Atomic, Molecular, and Optical Physics
JF - Physical Review A - Atomic, Molecular, and Optical Physics
SN - 1050-2947
IS - 6
M1 - 062506
ER -
ID: 50055762