Beryllium is known to defy conventional bonding motifs in even the smallest of molecular systems. Notable diatomic examples of anomalous bonds include the Be dimer, and dative bonding in BeF$^{-}$ anion. There is a fundamental interest in understanding how beryllium’s bonding characteristics develop with increasing molecular complexity. In the past year, we have moved forward with studies of triatomic species, specifically BeO$_{2}$$^{-}$ and BeC$_{2}$$^{-}$, through a combination of photoelectron velocity map imaging spectroscopy and \textit{ab initio} computational methods. In this talk, we will present our current understanding of the bonding in these molecules, with comparisons to previously characterized diatomic molecules (BeO$^{-}$, BeS$^{-}$, BeF$^{-}$).
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