Adsorption on Ordered Surfaces of Ionic Solids and Thin by F. J. Himpsel (auth.), Professor Dr. Hans-Joachim Freund,

By F. J. Himpsel (auth.), Professor Dr. Hans-Joachim Freund, Professor Dr. Eberhard Umbach (eds.)

Adsorption on Ordered Surfaces of Ionic Solids and skinny motion pictures introduces to a brand new and topical box of floor technology for which relatively little adventure is on the market at the moment. It studies the hot result of the hired analytical equipment comprising all glossy floor ideas together with scanning tunneling microscopy and numerous sorts of electron spectroscopies. the current prestige of this new, in actual fact outlined box of floor technology is sort of thoroughly overviewed via contributions from lots of the learn teams energetic during this box. The ebook is intended as a foundation for the predicted fast improvement during this quarter with functions in catalysis, thin-film and semiconductor expertise, sensors, electrochemistry, managed guidance of ultrathin epitaxial surfaces, and interfaces of insultors in addition to destiny molecular electronics.

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Additional resources for Adsorption on Ordered Surfaces of Ionic Solids and Thin Films: Proceedings of the 106th WE-Heraeus Seminar, Bad Honnef, Germany, February 15–18, 1993

Example text

Nt screening contribution to the peak shifts [2,3]. Finally we should mention that in the Hell spectra a rapid attenuation of the NaCl valence band with increasing SF6 coverage is observed. Up to monolayer coverage the CI 2p-derived peaks nearly completely disappear indicating a complete wetting of the surface (Frank-van der Merwe or Stranski-Krastanov growth) and a preferential adsorption of the SF6 molecules ontop ofthe CI ions. 2 Adsorption of Xe The adsorption and desorption behaviour of Xe on NaCl(lOO} is rather different from that of SF6.

In this paper we will focus our interest on the ordering of an adsorbed rare gas, Xe, on surfaces with fourfold and twofold symmetIy. As substrate we have chosen the NaCI(lOO) and the Ge(lOO) surfaces. As is well known from detailed structural investigations [9], the Ge(lOO) surface forms a mixture of (2xl), p(2x2) and c(4x2) reconstructions, whereas the NaCI(lOO) surface remains unreconstructed [10]. Ionic crystals with a wide band gap can be studied with low energy electrons only by using thin tilms so that charging effects can be avoided to a large extent.

We therefore first demonstrate how this can be achieved, using a model which tits the structural data quantitatively. Xenon phases and phase transitions are then described and shortly discussed. 2. Experimental Experiments are described in detail elsewhere [13]. 9 Pa) equipped with a high resolution LEED (SPA-LEED) instrument, an Auger electron spectrometer and a quadrupole mass spectrometer. Profile analysis of the diffracted beams was carried out with the SPA-LEED instrument with an effective transfer width larger than 1100 A.

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