Abstract
The Xe adsorption on Al(110) at 45 K has been studied by UPS, TDS and LEED. The Xe-TD spectra at low coverage (θ(Xe) ⩽ 0.1 ML) consist of a single peak at 70.4 K, independent on the coverage, suggesting a first-order desorption kinetics. An activation energy of desorption of 0.19 eV/atom and a frequency factor of 5 × 1013 s−1 has been determined. Beyond a coverage of θ(Xe) = 0.1 ML a change to zeroth-order desorption kinetics is accompanied by the appearance of a Xe-induced LEED pattern suggesting the formation of Xe islands. The LEED pattern exhibits the same periodicity, perpendicular to the surface rows, as the Al(110) substrate and suggests Xe adsorption along the surface troughs with a Xe-Xe interatomic distance of 4.41 Å. The Xe 5p12 and 5p32 photoemission peaks show two different characteristics as a function of the coverage. Below θ(Xe) = 0.1 ML the maximum of the 5p12 signal occurs at about 0.2 eV lower energy than above 0.1 ML. Only beyond θ(Xe)=0.1ML the 5p32 peak exhibits mj-splitting. All these observations are interpreted in terms of a 2D phase transition: 2D-gas (θ(Xe) ⩽ 0.1 ML) ↔ 2D-solid (0.1 ⩽ θ(Xe) ⩽ 1 ML).
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