Abstract
Oxygen adsorption on an alkali(Na, K, Cs)-covered Ge(100) surface was studied by Auger electron spectroscopy (AES), electron energy loss spectroscopy (EELS), thermal desorption (TD) and work function (WF) measurements. It was found that the preadsorbed alkali metal (AM) results in enhancement of the oxygen adsorption rate. The initial values of the oxygen sticking coefficient are exponential functions of AM induced WF changes. The EELS data show that low AM concentrations (θ AM < 0.1) change the oxidation state of the bare Ge(100) surface, i.e. an increase of the oxygen coordination number in the GeO x unit is observed. At high θ AM values, the EELS and TDS data imply the formation of a Ge-O-AM surface “compound” rather than of simple GeO x (1 < x < 2).
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