The adsorption of alkalis (Na, K) on Ni(1 1 1) and their coadsorption with CO and O were studied by high-resolution electron energy loss spectroscopy. Loss measurements of clean alkali adlayers provided the expected behaviour of the alkali-substrate vibration energy as a function of the alkali coverage. This result was achieved by eliminating any trace of CO contamination from the alkali adlayer. As a matter of fact, a significant softening of the alkali-Ni vibration energy was revealed in the alkali + CO coadsorbed phase. Moreover, alkali coadsorption with oxygen caused a weakening of the O-Ni bond and a strengthening of the alkali-Ni bond. (C) 2008 Elsevier B. V. All rights reserved.
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|Titolo:||Alkali adsorption on Ni(111) and their coadsorption with CO and O|
|Data di pubblicazione:||2008|
|Appare nelle tipologie:||1.1 Articolo in rivista|