Adsorption of Molecules on Metal, Semiconductor and Oxide by K. Christmann, H. J. Freund, J. Kim, B. Koel, H. Kuhlenbeck,

By K. Christmann, H. J. Freund, J. Kim, B. Koel, H. Kuhlenbeck, M. Morgenstern, C. Panja, G. Pirug, G. Rupprechter, E. Samano, G.A. Somorjai

Surface technological know-how is known as a comparatively younger clinical self-discipline, eager about the actual and chemical houses of phenomena on fresh and coated sturdy surfaces, studied below quite a few stipulations. The adsorption of atoms and molecules on stable surfaces is, for instance, this sort of , hooked up with roughly drastic adjustments of all floor homes. An adsorption occasion is usually saw in nature and located to be of technical value in lots of business approaches. accordingly, floor technological know-how is interdisciplinary by means of its very nature, and as such a major middleman among primary and utilized research.

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1 Adsorbate properties of hydrogen on solid surfaces 29 Semiconductor and insulator surfaces Surface C(100)-2×1 diamond C(100)-2×1 diamond C(111)-1×1 diamond C(0001) graphite (HOPG) Si(100)-2×1 Si(100)-2×1 Si(111)-7×7 Si(111) Si(111)-7×7 H adsorption Frequency factor states + desorption temperature 1st order [s-1] 2nd order [cm2/s] at sat’n [K] 5 1200 (low ΘH)... 5 × 1015 Ge(100) Ge(111) 650 (low Θ) 620 (high Θ) 493 (monohydride) Landolt-Börnstein New Series III/42A5 expts. performed with D atoms 90Ham atomic H inefficient to break C C dimer bonds expts.

Sect. 4). Without going into too much detail here it is simply referred to a review article [04Ptu] and some exemplary papers on H2 adsorption on graphite(0001) covering these low-temperature phenomena [85Fre2, 88Cui]. Landolt-Börnstein New Series III/42A5 Ref. p. 6 states Remarks Ref. , partial monolayer desorption expts. 73Ren 93And magneto-resistance expts. 92Lut physisorption of D2; TDS expts. 3 Hydrogen adsorption dynamics A special field of interest is the interaction of H2 molecules with the free-electron metal surfaces Cu, Ag, Au.

The respective difference depends, of course, on the number of interacting neighbors leading to a (more or less pronounced) coverage dependence of the adsorption energy, E(Θ ). This kind of coverage dependence described above is induced only by the adsorbed particles; the respective effect is called induced (a posteriori) energetic heterogeneity. As an example, we present in Fig. 6 a typical curve which has been measured for H adsorbing on Ni(111) under extremely clean and well-defined conditions in a glass apparatus [74Rin].

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