Adsorption on Surfaces and Surface Diffusion of Adsorbates by E.I. Altman, M. Bienfait, H.P. Bonzel, R. Diehl, M.Y.L.

By E.I. Altman, M. Bienfait, H.P. Bonzel, R. Diehl, M.Y.L. Jung, V.G. Lifshitz, M.E. Michel, R. Miranda, R. McGrath, K. Oura, A.A. Saranin, E.G. Seebauer, P. Zeppenfeld, A.V. Zotov

Floor technological know-how is known as a comparatively younger clinical self-discipline, fascinated about the actual and chemical homes of and phenomena on fresh and lined sturdy surfaces, studied lower than a number of stipulations. The adsorption of atoms and molecules on sturdy surfaces is, for instance, this type of , attached with roughly drastic alterations of all floor houses. An adsorption occasion is often saw in nature and located to be of technical value in lots of business approaches. therefore, floor technological know-how is interdisciplinary via its very nature, and as such a huge middleman among primary and utilized examine. the current quantity forty two is dedicated to lined reliable Surfaces and, particularly, Subvolume A to Adsorbed Layers on Surfaces. it's as this sort of choice of info received for adsorbates on well-defined crystalline surfaces. "Well-defined" capacity surfaces of identified crystallographic constitution and chemical composition.

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Example text

For example, the group of metal carbonyls consists of several metal atoms and CO molecules which are bonded through the carbon atom to the metal. In analogy, one expects CO to bond (involving the 5σ and 1π molecular orbitals of CO) via the carbon atom to a metal surface. Investigations of CO bonding to a large variety of metal surfaces have confirmed this cluster-surface analogy in many respects. From a techniques point of view three examples will be given here which demonstrate how adsorbed CO is oriented on a metal surface.

17b. A single CO species bonded perpendicularly to a high symmetry site on a surface is characterized by three occupied MOs, called the 4σ, 1π and 5σ (in order of decreasing binding energy). Since the symmetry of CO adsorbed on Ni(110) is only 2-fold, the 1π orbital is split into an x- and ycomponent. 4), which doubles the number of molecular orbitals compared to the that of an isolated adsorbed CO. Hence a total of eight MOs are expected. Depending on the geometry of the photoemission experiment and the polarization of the incident photons, excitation from different orbitals is enhanced.

Surface density N [1015cm−2] vs. pressure p (respectively ln(p/kT)) for CO adsorbed on Ni(110) measured at two temperatures of 182 and 298 K [70Kli]. The isotherms shown in Fig. 11 for T = 182 K and 298 K are then fitted to a theoretical isotherm based on the Devonshire cell model [37Dev]. Lateral interaction between adsorbed CO molecules as well as the substrate CO interaction are accounted for in this model. Under special assumptions, values of 106 kJ/mol and 15 kJ/mol are separately obtained for the heat of adsorption and the CO–CO interaction energy, respectively.

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