K. Christmann (auth.), H.P. Bonzel (eds.)'s Adsorbed Layers on Surfaces. Part 5: Adsorption of molecules PDF

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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 medical self-discipline, all for the actual and chemical homes of phenomena on fresh and lined stable surfaces, studied less than various stipulations. The adsorption of atoms and molecules on good surfaces is, for instance, the sort of , attached with roughly drastic alterations of all floor houses. An adsorption occasion is usually saw in nature and located to be of technical significance in lots of commercial procedures. as a result, floor technological know-how is interdisciplinary via its very nature, and as such a big middleman among basic and utilized research.

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

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In the column “remarks” a comment can be found on how the energy has actually been measured. 1 Adsorbate properties of hydrogen on solid surfaces [Ref. p. 2 Molecular hydrogen adsorption and physisorption phenomena D2 desorption rate [ML /s] Turning to physisorption of H2 first, it is agreed upon that physisorption is the ‘normal’ process to occur if chemically inert (insulating and/or semiconducting) surfaces are exposed to and interact with hydrogen gas at sufficiently low temperatures. We recall that free electron (alkali metal, alkaline earth and/or noble metal (Cu, Ag, Au) as well as most semiconductor) surfaces exhibit a surprisingly small activity to dissociate H atoms, in contrast to transition metal surfaces as was already pointed out in sect.

P. 1 Adsorbate properties of hydrogen on solid surfaces Criti- Experical mental temp. ; (1×2) cannot be saturated; population of subsurface sites complete phase diagram for H/Rh(311) det’d c(1×1) = 1st ordered phase → s0 = 1 phase diagram determined expts. 1 57 H-induced reconst. H-induced reconst. formation of subsurface H H-induced pairing-row reconstruction row-pairing reconstruction H-induced recon.

So far no complete structure determination of the bond geometry of physisorbed H2 molecules has been performed. It is worth to mention that the LEED intensities arising from the ordered H2 phases are as low as expected from kinematic theory [82Seg]. An example is provided in Fig. 9 taken from Seguine’s and Suzanne’s work on H on graphite(0001): The LEED pattern gives a convincing impression of the diffraction intensity differences between the graphite substrate and the ordered H2 overlayer. 0 Critical temp.

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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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