Abstract
1D hydrogen bond chains of D2O molecules formed on a Pt(211) stepped surface are observed by polarization dependent near O K-edge X-ray absorption fine structure spectroscopy (O K-NEXAFS). The 1s→ σ*OD resonance at 535.0 eV in the normal incidence O K-NEXAFS spectrum corresponds to the free OD bond oriented perpendicularly to the step lines, and the resonance at 540.0 eV is related to the hydrogen bond extended in a zigzag manner parallel to the step lines. A structural model consistent with these observations is obtained from the DFT optimization, in which all of the molecules act as one hydrogen donor and acceptor in the 1D chain.
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