Relativistic configuration interaction calculations of n=2 triplet states of heliumlike ions

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

OSTI ID:281377

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

Eigenfunctions and eigenvalues of the relativistic no-pair Hamiltonian are determined for the n=2 triplet states of heliumlike ions with charges in the range Z=5-100. The eigenfunctions are expanded in a basis of two-electron wave functions constructed from Dirac-Coulomb orbitals restricted to a finite cavity. The Hamiltonian matrix is evaluated and Davidson`s method is then used to determine the lowest few eigenfunctions and eigenvalues. These calculations, which include the Coulomb interaction and the retarded Breit interaction, are corrected for QED and mass polarization effects using values from Drake`s unified method and are compared with other calculations and with experiment. For low Z ions, the present calculations agree well with MBPT and with the unified method, but disagree substantially with MCDF calculations corrected for correlations. Our energy intervals and fine structures are consistent with experiment throughout the entire range of Z.

• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 281377
• 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
HAMILTONIANS
MULTICHARGED IONS
RELATIVISTIC RANGE