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

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

Adsorption on Ordered Surfaces of Ionic Solids and skinny movies introduces to a brand new and topical box of floor technological know-how for which particularly little adventure is accessible at the present. It studies the hot result of the hired analytical tools comprising all glossy floor innovations together with scanning tunneling microscopy and diverse types of electron spectroscopies. the current prestige of this new, truly outlined box of floor technology is almost thoroughly overviewed via contributions from lots of the examine teams lively during this box. The e-book is intended as a foundation for the anticipated fast improvement during this quarter with purposes in catalysis, thin-film and semiconductor know-how, sensors, electrochemistry, managed coaching of ultrathin epitaxial surfaces, and interfaces of insultors in addition to destiny molecular electronics.

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Extra info 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

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At the spectrum taken from SF6 adsorbed' on about 5 layers of NaCI (2nd from bottom) is identical to the (broadened) spectrum from the gas phase. Structure B appears for all other substrates. It is the more intense (with respect to structure A) the stronger the bonding to the substrate is. In particular for a Na precovered surface structure B is dominating, in agreement with a likely hybridization ofNa 3s and SF6 orbitals [8]. Thus we must conclude that structure B is due to an Auger initial state which has been prepared by charge transfer screening from the substrate into the SF6 molecule.

Our results for XelNaCI show that a well ordered Xe monolayer can be formed. Due to the interaction with the fourfold substrate potential a distorted hexagonal layer is formed. A very similar behaviour was observed for ArlMgO(lOO) [8] where the mismatch of lattice constants between bulk Ar and MgO is about as large as for XelNaCI(100). An even -larger uniaxial change of lattice constants as a function of gas pressure than in our case was found there. The isosteric heats of adsorption obtained in our measurements for the phase transition to a 2-dimensional solid are about 5% smaller than those obtained by Ewing et al.

10). 6. Conclusion Single crystalline thin films of NaCl and KCI provide a simple way to study all kinds of surface properties with electron spectroscopy techniques, as long as electrons with energies over 30 - 50 eV and current doses over about 1 JiA's are avoided. Both structural and electronic data are obtained with a fixed Fermi level position provided by the substrate. Water adsorption yields a well defined 2D-phase in equilibrium with the water vapor. From a phase diagram the activation energies for the phases are derived.

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