Abstract

Relativistic excitation energies and transition rates from the $^{1}S_{0}$ ground states to the first $^{3}P_{1}$ and $^{1}P_{1}$ 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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