Relativistic configuration-interaction calculations for the ground state and [ital n]=2 singlet states of heliumlike ions

Journal Article · Fri Jul 01 04:00:00 EDT 1994 · Physical Review A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.50.247· OSTI ID:7295949

Cheng, K T; Chen, M H ^[1]; Johnson, W R; Sapirstein, J ^[2]

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

Term energies are determined for the ground state and [ital n]=2 singlet states of heliumlike ions with nuclear charges in the range 4[le][ital Z][le]92. These calculations are based on the relativistic no-pair Hamiltonian which includes both the Coulomb interaction and the retarded Breit interaction. Single-particle wave functions are expanded in a [ital B]-spline basis constructed from Dirac-Coulomb orbitals restricted to a finite cavity. The Hamiltonian matrix is evaluated and Davidson's method is used to determine the lowest few eigenenergies and eigenfunctions for each angular symmetry. Quantum electrodynamic corrections are also calculated. We find good, but not precise, agreement between theory and experiment for the [ital K][alpha] x-ray energies. It is argued that high-precision x-ray measurements for highly charged ions are needed to further test the theory.

• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 7295949
• Journal Information: Physical Review A; (United States), Journal Name: Physical Review A; (United States) Vol. 50:1; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

664100* -- Theory of Electronic Structure of Atoms & Molecules-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
ATOMIC NUMBER
ATOMS
CALCULATION METHODS
CHARGED PARTICLES
CONFIGURATION INTERACTION
EIGENVALUES
ELEMENTS
ENERGY LEVELS
EXCITED STATES
FLUIDS
GASES
GROUND STATES
HELIUM
IONS
ISOELECTRONIC ATOMS
MULTICHARGED IONS
NONMETALS
RARE GASES