Relativistic configuration interaction calculations of the ground state and n=2 singlet states of heliumlike ions

Journal Article · Sat May 01 04:00:00 EDT 1993 · Bulletin of the American Physical Society

OSTI ID:281376

Cheng, K T; Chen, M H; Johnson, W R

The term energies based on the relativistic no-pair Hamiltonian including the Coulomb interaction and the retarded Breit interaction are determined for the ground state and n=2 singlet states of heliumlike ions with charges 4{<=}Z{<=}92. The eigenfunctions are expanded in a B-spline basis constructed from Dirac-Coulomb orbitals restricted to a finite cavity. The Hamiltonian matrix is evaluated and Davidson`s method is then employed to determine the lowest few eigenfunctions and eigenvalues. These calculations corrected for QED and mass polarization effects using values from Drake`s unified method are compared with other theoretical predictions and with experiment. For low Z ions, our results agree well with the unified method. For the ground state of He-like uranium, the present calculation differs from the unified method by 6.2 eV. Possible systematic discrepencies in K{alpha} x-ray energies between theory and experiment are discussed.

• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 281376
• Report Number(s): CONF-9305421--
• Journal Information: Bulletin of the American Physical Society, Journal Name: Bulletin of the American Physical Society Journal Issue: 3 Vol. 38; ISSN BAPSA6; ISSN 0003-0503
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CALCULATION METHODS
EXCITED STATES
GROUND STATES
HAMILTONIANS
QUANTUM ELECTRODYNAMICS
RELATIVISTIC RANGE
URANIUM IONS