Relativistic excitation energies and transition rates from the ¹S₀ ground states to the first ³P₁ and ¹P₁ excited states of berylliumlike ions are determined by using the newly developed multiconfiguration relativistic random-phase approximation (MCRRPA). Results from the MCRRPA theory are compared with those from other theories and experiments. The large discrepancies between the single-configuration RRPA predictions of excitation energies and the precise experimental values are resolved.
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Johnson et al. (1982) studied this question.
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