berylliumlike

{{quote-journal|en|year=2015|date=|author=Pedro Amaro, Filippo Fratini, Laleh Safari, Jorge Machado, Mauro Guerra, Paul Indelicato, José Paulo Santos|title=Relativistic evaluation of the two-photon decay of the metastable 1s²2s 2p~³ mbox P₀ state in berylliumlike ions with an active-electron model|journal=arXiv|url=http://arxiv.org/abs/1508.06169|doi=|volume=|issue=|pages=