Relativistic configuration-interaction calculation of the polarizabilities of heliumlike ions

Journal Article · Fri Mar 01 04:00:00 EST 1996 · Physical Review A

DOI:https://doi.org/10.1103/PhysRevA.53.1375· OSTI ID:279010

Johnson, W R ^[1]; Cheng, K T ^[2]

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1. Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556 (United States)
2. University of California, Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)

Polarizabilities of ions of the helium isoelectronic sequence with nuclear charges in the range 2{le}{ital Z}{le}30 are evaluated starting from the relativistic no-pair Hamiltonian and including both the Coulomb and Breit interactions. The ground state and perturbed wave functions are expanded in two-electron basis functions constructed from {ital B} splines. For each ion, the ground-state wave function is determined by a configuration interaction calculation; the perturbed wave function is then found by solving an inhomogeneous algebraic equation. Nonrelativistic calculations are carried out in parallel with the relativistic calculations, permitting relativistic corrections to be isolated. The present nonrelativistic calculations are found to be in good agreement with other precise calculations. For the experimentally interesting case of heliumlike lithium, we obtain the value {Delta}{alpha}{sub Rel}={minus}(4.50{plus_minus}0.05){times}10{sup {minus}5} a.u. for the relativistic correction to the ground-state polarizability. {copyright} {ital 1996 The American Physical Society.}

• Research Organization: Lawrence Livermore National Laboratory
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 279010
• Journal Information: Physical Review A, Journal Name: Physical Review A Journal Issue: 3 Vol. 53; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
AB INITIO CALCULATIONS
ATOMIC IONS
CONFIGURATION INTERACTION
CORRECTIONS
GROUND STATES
HAMILTONIANS
HE-LIKE IONS
HELIUM
LI-LIKE IONS
LITHIUM
ONE-DIMENSIONAL CALCULATIONS
PERTURBATION THEORY
POLARIZABILITY