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The vibrational properties of H adsorbed on Pt(111) have been studied with high-resolution electron energy-loss spectroscopy. A new assignment of the principal features indicates that the parallel modes are softer than predicted by the near-neighbor central force-constant (NNCFC) model. It is proposed that H parallel modes are consistently soft on fcc (111) and hcp (0001) surfaces; the implications of this vibrational mode analysis on both the utility of the NNCFC model and the accuracy of various theoretical models for H--metal bonding are discussed.
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Richter et al. (1987) studied this question.
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