Relativistic configuration interaction calculations of transitions for low-lying states in the helium isoelectronic sequence

Abstract

The excitation energy and the oscillator strength values have been computed for the 1s2–1s2p, 1s2s–1s2p, 1s2s–1s3p transitions in the helium isoelectronic sequence (Z=2 through Z=116). The importance of the Breit interaction and radiative corrections to the oscillator strength as well as transition energies have been studied. The method of calculations was based on the relativistic hydrogen-like (with non-integer nuclear number) wavefunctions.