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Excited states of polonium(<scp>iv</scp>): electron correlation and spin–orbit coupling in the Po<sup>4+</sup> free ion and in the bare and solvated [PoCl<sub>5</sub>]<sup>−</sup> and [PoCl<sub>6</sub>]<sup>2−</sup> complexes
Polonium (Po, Z = 84) is a main-block element with poorly known physico-chemical properties. Not much information has been firmly acquired since its discovery by Marie and Pierre Curie in 1898, especially regarding its speciation in aqueous solution and spectroscopy. In this work, we revisit the absorption properties of two …