Abstract
The interaction of water on clean and caesium dosed Cu{110} has been investigated as a model for the simulation of electrochemical double layers in ultrahigh vacuum. We present new data from high resolution electron energy loss spectroscopy (HREELS) and electron stimulated desorption ion angular distributions which provide a detailed picture of the growth and structure of water on clean Cu{110}. Water adsorbs molecularly on this surface and forms hydrogen bonded clusters at all coverages. The presence of caesium has a strong influence on the adsorption of water. For ΘCs=0.06 water is molecularly adsorbed with an increase in the heat of adsorption. The strongly bound water is associated with an increase in the work function and with striking changes in the HREELS spectra: the libration mode at 750 cm−1, which dominates the clean surface water spectrum, is absent in the presence of caesium. These effects are attributed to a reorientation of water in the vicinity of the caesium adatom.
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