Far-configuration-mixing effects on hyperfine-structure (HFS) off-diagonal elements are computed in Sc I and Ti I using the multiconfigurational Hartree-Fock method. They are about two orders of magnitude larger than the Hartree-Fock values of the pure-configuration off-diagonal elements. Taking them into consideration improves the HFS interpretation in the 3d4s 2 configuration of scandium I.
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Bauche et al. (1977) studied this question.
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