Abstract
Results from systematic multiconfiguration Hartree-Fock calculations of isotope shifts and oscillator strengths are reported for the and transitions in the Be isoelectronic sequence (Z = 4-10). In addition values for the same properties as well as for the hyperfine interaction constants are presented for the - transitions in Mg I. Different models for electron correlation are used, and it is shown that valence and core-valence effects alone are not sufficient to obtain accurate values for the isotope shifts, but that also core-core effects need to be accounted for.
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