Abstract
The adsorption of Xe on ZnO(101̄0), (0001)Zn and (0001̄)O surfaces was investigated by means of LEED, thermal desorption (TDS) and angle-resolved UV photoelectron spectroscopy (ARUPS) in the temperature range between 40 and 70 K. Both LEED and TDS indicate that on the (101̄0) prism face Xe adsorbs first in the troughs of the surface. An ordered close-packed monolayer does not exist. However, the first layer orders during multilayer growth under the collaboration of second-layer atoms. Finally, single crystalline domains of bulk Xe grow. On the polar faces Xe does not condense within ordered phases. For all three faces an electronic binding energy of E B V =−12.40 ± 0.10 eV is found for the Xe 5p 1 2 level within the complete monolayers and multilayers. For the first half of the monolayer E B V is lowered by 0.5 eV on the (0001̄)O face and increased by 0.3 eV on the (101̄0) face. These changes of E B V are attributed to different shielding of the final-state hole. On all three faces redistribution within the oxygen-derived ZnO emission is found which is interpreted as redistribution from an oxygen surface resonance into a bulk-like emission.
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