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The geometry and chemical bonding of Au2H2–/0 have been investigated by using photoelectron velocity map imaging spectroscopy and theoretical calculations. The Au2H2– cluster adopts a distorted Y-shaped structure, featuring one H atom bridging two Au atoms and another H atom terminally bonded to one Au atom. The unusually low frequency of the Au–H stretching vibration observed in the current spectrum can be attributed to the delocalized 3c-2e bonding interaction associated with a bridging H atom as well as the synergistic donation and back-donation interactions between the two AuH subunits.
Li et al. (Fri,) studied this question.
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