New PDF release: Adsorbed Layers on Surfaces. Part 5: Adsorption of molecules

By K. Christmann (auth.), H.P. Bonzel (eds.)

ISBN-10: 3540258485

ISBN-13: 9783540258483

ISBN-10: 3540393579

ISBN-13: 9783540393573

Surface technology is known as a comparatively younger clinical self-discipline, enthusiastic about the actual and chemical homes of phenomena on fresh and coated stable surfaces, studied below a number of stipulations. The adsorption of atoms and molecules on stable surfaces is, for instance, this sort of situation, attached with roughly drastic alterations of all floor homes. An adsorption occasion is often saw in nature and located to be of technical significance in lots of business approaches. hence, floor technological know-how is interdisciplinary through its very nature, and as such an enormous middleman among primary and utilized research.

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Extra info for Adsorbed Layers on Surfaces. Part 5: Adsorption of molecules on metal, semiconductor and oxide surfaces

Example text

67 max. H coverage determined by nuclear reaction analysis (NRA) complicated phase diagram; H-driven surface reconstructions (periodic distortions) partially involved ; several T-dependent phase transitions 98Mij 89McC 96Lee 79Est 80Bar 87Pry 80Ben Landolt-Börnstein New Series III/42A5 Ref. p. 1 Adsorbate properties of hydrogen on solid surfaces Criti- Experical mental temp. 65... 70 Å 55 Remarks Reference H-induced reconstr. 2; T-dependent phase transitions 86Zae H-induced surface reconstr. 65 Å (1×1) phase 87Alt 97Arn1 99Arn 93Lop H driven reconstr.

Due to the limited space we will exclude bulk diffusion phenomena from our considerations, although certain metals such as Pd, V, Ti, Zr, Nb, Ta etc. can under appropriate thermodynamic conditions absorb large quantities of hydrogen which makes these materials interesting for hydrogen storage. For details on this subject as well as on a general formal description of diffusion phenomena, the reader is referred to the respective monographs and textbooks [65Jos, 78Ale]. We recall that especially Pd surfaces exhibit a variety of phenomena which involve diffusion steps, overlayer - underlayer (surface subsurface) transitions and absorption/hydride formation processes.

In 1972 Ertl and Neumann introduced the laserinduced thermal desorption technique [72Ert], which was then further improved [86See, 86Mak1, 87Mak1, 87Mak2]: This method is based on the ‘hole refilling’ phenomenon: A focused laser beam illuminates a well-defined patch on the surface with an energy just sufficient to thermally desorb all the particles in that area. The refilling of the hole from the unperturbed surrounding is then followed as a function of time by subsequently fired laser pulses. The refilling signal is then fitted to expressions derived from Fick’s second law.

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Adsorbed Layers on Surfaces. Part 5: Adsorption of molecules on metal, semiconductor and oxide surfaces by K. Christmann (auth.), H.P. Bonzel (eds.)


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