Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 122, Issue 15, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1879752
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We combine photoelectron and x-ray absorption spectroscopy with density functional theory to derive a molecular orbital picture of the hydrogen bond in ice. We find that the hydrogen bond involves donation and back-donation of charge between the oxygen lone pair and the O-H antibonding orbitals on neighboring molecules. Together with internal s-p rehybridization this minimizes the repulsive charge overlap of the connecting oxygen and hydrogen atoms, which is essential for a strong attractive electrostatic interaction. Our joint experimental and theoretical results demonstrate that an electrostatic model based on only charge induction from the surrounding medium fails to properly describe the internal charge redistributions, upon hydrogen bonding. (c) 2005 American Institute of Physics.
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