Abstract
The authors report extensive multiconfiguration Hartree-Fock (MCHF) calculations, taking into account valence correlation and core-relaxation effects, of energy levels, eigenvector compositions, electric dipole and quadrupole oscillator strengths involving the n1S(n=1-4), n1PO (n=1, 2), n1D(n=1-3) and n1FO(n=1, 2) states in Ca I. On the whole, the agreement between theory and observation has been improved by their set of MCHF results. The theoretical transition probabilities allow the evaluation of the lifetimes for the levels 4s4p, 4s5p 1PO; 4s4d, 4p2 1D and 3d4p, 4s4f 1FO which are compared with previous measurements. The differences between MCHF calculations for series perturbed by doubly-excited states in Ca and Sr are discussed. It is concluded that core-polarization effects are of about the same importance in the two atoms but that the effects on the 3d (Ca) and 4d (Sr) orbitals are such that the total core-polarization effects for series and perturbers are of the same magnitude in Sr while large differences exist in Ca.
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