Abstract
An experimental apparatus designed to study structural and electronic properties of surfaces is described. Ultraviolet photoemission (UPS) and metastable deexcitation spectroscopies (MDS) have been implemented in order to obtain information on electronic states in the valence-band region with different surface sensitivity. The supersonic metastable beam source is fully described and characterized by time-of-flight measurements while the characteristics of the apparatus have been tested in the study of the Ag(110) surface, clean and following the dissociative chemisorption of oxygen. Exploiting the surface sensitivity of MDS, measurements as function of the oxygen coverage allow a direct correlation between work function increase and the population of the s-p bands of the substrate near the Fermi edge. Oxygen-induced states around 7.5 eV, difficult to observe in UPS because of strong contributions from the d bands of the substrate, are also detected.
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