Abstract

Multiconfiguration Dirac–Fock (MCDF) calculations are used to interpret the field shift contributions to isotope shifts of Sm I in visible and near-UV transition lines. The investigated lines correspond to the transitions between the ground configuration 4f66s2 and the excited configurations 4f66s6p and 4f55d6s2. For the 6s6p transition the field shift is negative as a result of the reduced 6s electron occupation, whereas for the 4f5d transition the field shift is positive because of the decreased screening of 6s and inner-shell electrons. MCDF calculations for the electron charge density at the origin that include the configuration mixing effect agree well with the electronic factor ratios derived from experimental data with the exception of a few cases of 6s6p transitions.

© 2005 Optical Society of America

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