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Identifies Ag2H2- structure via photoelectron imaging, suggesting unique bonding features.
Ag2H2- is identified and characterized by photoelectron velocity-map imaging and quantum chemical calculations. High-resolution mass selection unambiguously confirms the formation of Ag2H2-, yielding a vibrationally resolved spectrum with a distinct progression assigned to the Ag-H stretching mode. Comparison between experiment and theory shows that Ag2H2- adopts a distorted Y-shaped geometry with one bridging H and one terminal H, while for neutral Ag2H2, this geometry is a local minimum. Further bonding analysis of the corresponding neutral counterpart reveals that the unusually low Ag-H stretching frequency originates from synergistic donation and back-donation between the two AgH subunits.
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LI et al. (2026) studied this question.
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