By K. Christmann (auth.), H.P. Bonzel (eds.)
Surface technological know-how is known as a comparatively younger medical self-discipline, interested in the actual and chemical homes of phenomena on fresh and coated strong surfaces, studied lower than a number of stipulations. The adsorption of atoms and molecules on reliable surfaces is, for instance, one of these , attached with roughly drastic alterations of all floor houses. An adsorption occasion is often saw in nature and located to be of technical significance in lots of commercial strategies. as a result, floor technological know-how is interdisciplinary by means of its very nature, and as such a massive middleman among basic and utilized research.
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Additional resources for Adsorbed Layers on Surfaces. Part 5: Adsorption of molecules on metal, semiconductor and oxide surfaces
The strictly molecular nature of this adsorption bond can be established either by H2/D2 isotope exchange experiments (absence of isotopic scrambling) or by measurements of the H-H stretching vibration which should yield a frequency close to the gas phase value 4153 cm−1 [86Mar]. 5 0 5 6 7 10 Temperature T [K ] 15 Fig. 7: Thermal desorption spectra for molecular deuterium multilayers on (1×1)D/Ru(0001). At least five layers can be distinguished from the various TD maxima. 5 K to the 4th and 5th layer, respectively.
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. 0 (1×2)rec after annealing at 150 K Al(111) ca. 7 91Spr 94Spr 80Fei2 adsorption at 80 K 88Kom 77Boz Landolt-Börnstein New Series III/42A5 Ref.
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. 2 Å expts. performed at 87Lin 170 K; no subsurface H 86Feu adsorption expts. performed at 170 K expts. 1 Adsorbate properties of hydrogen on solid surfaces Ordered H phase Coverage [ML] and /or [H atoms/m2] Ru(11−21) no Hinduced superstructure (1×1)?
Adsorbed Layers on Surfaces. Part 5: Adsorption of molecules on metal, semiconductor and oxide surfaces by K. Christmann (auth.), H.P. Bonzel (eds.)