Abstract
An overview is given on the application of metastable impact electron spectroscopy, in combination with UPS, to the study of clean magnesia and titania surfaces and their interaction with metal atoms and small molecules. The mechanisms for metal adsorption on reducible (titania) and non-reducible (magnesia) substrates are different: while on titania the metal atom often bonds by electron transfer to Ti3d states, it is hybridization of the adsorbate and anion wavefunctions which accounts for the bonding on MgO. In the case of H 2O, molecular adsorption takes place both on MgO and TiO 2; on the other hand, water-alkali coadsorption leads to hydroxide formation. In the case of CO 2, chemisorption takes place in form of carbonate (CO 3) species. These originate from the CO 2 interaction with O 2− surface anions. While for CaO chemisorption takes place at regular oxygen sites, for MgO this occurs at low-coordinated oxygen ions only; for TiO 2 chemisorption requires alkali coadsorption.
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