Relativistic multireference many-body perturbation-theory calculations on the multiple openshell states in siliconlike Ar and aluminumlike Fe ions

摘要: Energies of the ground and a number even- odd-parity excited states multi-valence-electron ions have been computed by computational method in framework relativistic multireference many-body perturbation theory. Relativistic calculations are reported for over 80 low-lying odd- even-parity siliconlike argon (Ar{sup 4+}) aluminumlike iron (Fe{sup 13+}) to demonstrate unprecedented accuracy method. The theory deviates from experiment less than 0.2% all but few levels argon. For more highly ionized iron, deviations reduced within 0.06%. Theoretical magnetic dipole electric quadrupole transition rates lowest-lying {sup 2}P{sub 3/2}{sup o} state Fe Mn evaluated, lifetimes compared with recent ion trap experiment.