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

ISBN-10: 3540254846

ISBN-13: 9783540254843

ISBN-10: 3540258485

ISBN-13: 9783540258483

Surface technological know-how is known as a comparatively younger clinical self-discipline, keen on the actual and chemical homes of phenomena on fresh and coated stable surfaces, studied lower than various stipulations. The adsorption of atoms and molecules on reliable surfaces is, for instance, this sort of situation, attached with kind of drastic adjustments of all floor homes. An adsorption occasion is often saw in nature and located to be of technical value in lots of business procedures. therefore, floor technology is interdisciplinary through its very nature, and as such a huge middleman among primary and utilized research.

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Extra info for Adsorption of Molecules on Metal, Semiconductor and Oxide Surfaces (Landolt-Börnstein: Numerical Data and Functional Relationships in Science and Technology - New Series / Condensed Matter)

Sample text

To illustrate this internal correlation, we have, in the following table, listed the number of desorption states and the temperature position of the TD maxima, together with the respective frequency factors. Note that the desorption energy Edes refers to the actual energy that a particle must overcome to leave the potential energy well. For non-activated adsorption Edes actually equals the adsorption energy Ead. Only in the case of activated adsorption, Edes consists of the adsorption energy Ead, plus the height of the activation barrier, E*ad.

Performed with H atoms expts. 145 β1 230 340 β2 490 β3 ~640 β4 β1 330 675 β2 shoulder 350 420 β2 shoulder 420 490 β2 α 240 300 β1 470 β2 α 240 β 400 β 400 A 125 B 240 C 365 β1 200 390 β2 β1 200 380 β2 β1 ~200 (shoulder only) β2 290 Frequency factor 1st order [s−1] [Ref. p. 111 Remarks Ref. subsurface species expts. 5 × 10−2 00Mor 80Ibb 88Cha TDS 87Eng 2 × 10−6 Landolt-Börnstein New Series III/42A5 Ref. p. 1 Adsorbate properties of hydrogen on solid surfaces H adsorption states + desorption temperature at sat’n [K] β1 240 380 β2 β1 190 270 β2 α1 170 245 α2 270 α3 β1 shoulder 430 β2 β1 ~350 β2 ~410 ~240 α1 ~260 α2 state 1 390 state 2 350 (shoulder) peak “2” 330 peak “1” 360 γ1 200 γ2 218 γ3 240 α3 366 a1 195 a2 225 330 a3 b 375 γ1 194 216 γ2 237 γ3 246 α1 336 α2 377 α3 β1 170 230 β2 β1 175 300 β2 α 180 ~220 β1 β2 290 β1 220 β2 310 β β1 β2 β1 β2 Frequency factor 1st order [s−1] Remarks 27 Ref.

10 K regime, and actually several studies have been carried out with physisorbed hydrogen, especially on graphite surfaces, aiming at formation of ordered phases and two-dimensional phase transitions [82Seg, 85Fre2, 87Fre, 88Cui, 89Cui] or at the mechanism of the ortho – para hydrogen conversion [83And, 97Sve]. The sticking probability under these conditions is difficult to estimate, since the phonon-assisted mechanism may not be very effective. Rather, particle scattering effects within the adsorbed H2 layer are essential, leading to an increase of s with coverage, but no systematic studies of the sticking behavior of physisorbed hydrogen have been performed to our knowledge.

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Adsorption of Molecules on Metal, Semiconductor and Oxide Surfaces (Landolt-Börnstein: Numerical Data and Functional Relationships in Science and Technology - New Series / Condensed Matter) 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


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