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

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 technology is known as a comparatively younger clinical self-discipline, fascinated with the actual and chemical houses of and phenomena on fresh and lined stable surfaces, studied below various stipulations. The adsorption of atoms and molecules on stable surfaces is, for instance, one of these situation, hooked up with roughly drastic adjustments of all floor houses. An adsorption occasion is often saw in nature and located to be of technical value in lots of commercial strategies. consequently, floor technology is interdisciplinary by way of its very nature, and as such an immense middleman among basic and utilized study. the current quantity forty two is dedicated to coated stable Surfaces and, specifically, Subvolume A to Adsorbed Layers on Surfaces. it truly is as the sort of selection of information received for adsorbates on well-defined crystalline surfaces. "Well-defined" capability surfaces of identified crystallographic constitution and chemical composition.

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Additional info for Adsorption on Surfaces and Surface Diffusion of Adsorbates (Landolt-Börnstein: Numerical Data and Functional Relationships in Science and Technology - New Series Condensed Matter)

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Therefore the heat of adsorption depends on the adsorption site and on the surface structure in general. e. if no dissocation occurs, and if there is no significant activation barrier for adsorption, the heat of adsorption and the activation energy of desorption should be approximately the same. This comparison has been made for CO on Ni(110) for which calorimetric, isosteric and desorption measurements exist [73Mad, 90Fei, 92Dea, 93Stu]. 0 Fig. 10. Heat of adsorption Q vs. apparent coverage θ for CO adsorbed on Ni(110) at 300 K.

2 16 19 22 25 ln (p/kT) 28 31 34 Fig. 11. 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.

Large solid angle XPD intensity patterns for CO/Ni(110) in the (2×1)p2mg configuration. Azimuthal surface orientation same as in fig. 17. (a) upper part: experimental data, 2-fold averaged, (b) lower part: single scattering calculation [98Emu]. Angle-resolved XPD measurements of C1s intensities from the well ordered (2×1)p2mg-CO layer over a large solid angle are in good agreement with the structure model [75Lam]. Figure 14 showed already four C1s peaks for the [001] azimuth in a single polar angle scan.

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