Abstract
Oxides are important materials in a variety of aspects. The most prominent field of application of oxides is catalysis, where oxides are employed both as active catalysts as well as supports [1–2]. Almost everything we know about adsorption and reaction of molecules on oxide surfaces we know from infrared studies on oxide powder surfaces [2]. However, it is our view [3–7] that these studies should be supplemented by investigations of single crystalline oxide surfaces in order to reveal information on the geometric and electronic structure of the adsorbed molecules as well as the influence of crystal orientation on adsorption. Several groups have started in recent years to study the adsorptive behaviour of bulk oxide single crystals [1, 8, 9]. If the oxide has low thermal and electric conductivity the established methods in surface science, which are often electron spectroscopic methods, cannot be used due to surface charging effects. A way out is to use epitaxially grown oxide films on metal substrates which do not show charging effects in those cases where oxide bulk single crystals are not suitable [3-7].
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