Adsorbed Layers on surfaces by H. P. Bonzel, R. Denecke, W. Eck, A. Föhlisch, G. Held, W.

By H. P. Bonzel, R. Denecke, W. Eck, A. Föhlisch, G. Held, W. Jaegermann, N. Martensson, T. Mayer, H. Over, H. P. Steinrück

Surface technological know-how is known as a comparatively younger clinical self-discipline, excited about the actual and chemical homes of phenomena on fresh and coated strong surfaces, studied below a number of stipulations. The adsorption of atoms and molecules on stable surfaces is, for instance, one of these situation, hooked up with kind of 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 methods. for that reason, floor technology is interdisciplinary by means of its very nature, and as such a tremendous middleman among basic and utilized research.

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Investigations of nitrogen adsorption are also interesting for the formation of metal-nitrides. The development of metal nitrides poisons the activity of a metal surface towards ammonia synthesis; this is particularly true with Fe [87S1]. 4 Fe Fig. 13. The activity of various transition metals for ammonia synthesis is shown as a function of the degree of filling the d-band [81O2]. 0 In general, the bonding of atomic nitrogen on metal surfaces is stronger than that of atomic oxygen (see Table 11).

2 Adsorption of C, N, and O on metal surfaces [Ref. p. 2 The heat of adsorption of chemisorbed oxygen overlayers on metal surfaces Table 2. Heat of adsorption. t. 8ML initial Variable O cov. initial initial initial initial initial initial initial initial initial initial c(2×4) initial 66B1 60B1 87M1 69M1 90S3/TDS 92G2 76I1/TDS 60B1/TDS 66B1/TDS 60B1/TDS 93A2/MC 91B3/MC 93A2/MC 93A2/MC 60W1, 60B1 99Y2/TDS 99Y2/TDS 89G1/TDS 77C2/TDS 90B1/TDS 90B1/TDS 88C1/TDS 93K2 93K2 60B1 96W2/MC 96W2/MC 77W2/TDS Landolt-Börnstein New Series III/42A4 Ref.

630 K expos. 5 L O2 (2×2)-1O Mo(111) low cov. 9 O(1s) (2×2)O O(2p) chemisorbed O oxidic-O surface oxidic-O bulk on-surface O subsurface O MgO O chem. transition from O-derived 2p to levels of an MgO species. 8 Method UPS EELS ARPES ARPES PES Ref. 76B1, 77R3 84S3 95Z1 95Z1 96M1 XPS 97L2 UPS XPS 77C3, 78K1 76Z1 UPS PES 79K1 89T1 ELS 81H1, 81N1 EELS XPS 82F1 81G1 94D1 Fermisurface mapping: global Peierls distortion induces the (2×2) ordering. UPS HeI HeII HeII O(1s)-shift XPS Mo(3d)-shift UPS strong dispersion of 2 eV along the Ni-O ARUPS chains.

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