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The coadsorption of Na∕CO on Ni(111) has been investigated using high-resolution electron energy loss spectroscopy. Loss measurements showed that coadsorbed CO molecules dramatically affect the vibrational properties of Na adatoms. The Na-Ni vibration energy at 220.3em0exmeV measured on the Na∕Ni system shifted down to 120.3em0exmeV for the CO∕Na∕Ni surface. This result was ascribed to a charge transfer from Na to CO. On the contrary, no appreciable shift of the Na-Ni stretching frequency was observed for the coadsorption of Na with oxygen.
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Politano et al. (2007) studied this question.
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