Abstract

Using density functional theory calculations we have investigated the geometries and electronic structures of a series of neutral alkaline earth auride clusters with chemical formula Au 4 M, with M = Mg, Ca, Sr, and Ba. These clusters are formally made of an Au 4 2- unit and a doubly-charged M 2+ cation. Of the three geometries investigated herein, namely planar, square-pyramidal, and lantern-type geometry, the planar structure is the most energetically favored. Because all structures are characterized by positive vibrational frequencies, these clusters represent local minima on the corresponding potential energy hypersurface.

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