Orientation dependent adsorption of oxygen on a cylindrical Ge sample
作者： H.J. Kuhr , W. Ranke
DOI: 10.1016/0039-6028(88)90494-3
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摘要: The dependence of oxygen adsorption on the crystallographic surface orientation was studied a cylindrical Ge sample with [110] as cylinder axis by Auger electron and photoelectron spectroscopy. At 300–340 K, is slowest at (110), (111) (113) increases in vicinity these orientations due to step-enhanced adsorption. 650 faster, especially (111). analysis chemical shifts associated 3d emission six yields discrete towards higher binding energy for atoms 1, 2 or 3 ligands (Ge1+, Ge2+, Ge3+). 340 Ge1+ Ge2+ components have similar intensities. Their average positions are about −0.7 −1.7 eV respect bulk (towards energy). component becomes more prominent, corresponding formation predominantly GeO. Surprisingly, become strongly dependent, varying between −0.56 (331) −1.17 (001) −1.72 −2.03 Ge2+. Also weak Ge3+ −2.8 but no Ge4+ observed. A shift O 2s orbital from −21.9 −22.4 observed when going adsorbed GeO-like configuration.
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