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Titolo:
The first layers of water on Ru(001)
Autore:
Lilach, Y; Romm, L; Livneh, T; Asscher, M;
Indirizzi:
Hebrew Univ Jerusalem, Dept Phys Chem, IL-91904 Jerusalem, Israel Hebrew Univ Jerusalem Jerusalem Israel IL-91904 -91904 Jerusalem, Israel Hebrew Univ Jerusalem, Farkas Ctr Light Induced Proc, IL-91904 Jerusalem, Israel Hebrew Univ Jerusalem Jerusalem Israel IL-91904 -91904 Jerusalem, Israel
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 14, volume: 105, anno: 2001,
pagine: 2736 - 2742
SICI:
1520-6106(20010412)105:14<2736:TFLOWO>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
COLLISION-INDUCED DESORPTION; ADSORPTION; H2O; CLUSTERS; OXYGEN; PT(111); NI(111); BILAYER; N-2; DISSOCIATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
36
Recensione:
Indirizzi per estratti:
Indirizzo: Asscher, M Hebrew Univ Jerusalem, Dept Phys Chem, IL-91904 Jerusalem, Israel Hebrew Univ Jerusalem Jerusalem Israel IL-91904 salem, Israel
Citazione:
Y. Lilach et al., "The first layers of water on Ru(001)", J PHYS CH B, 105(14), 2001, pp. 2736-2742

Abstract

The initial growth of water molecules to form the first bilayer and then ice layers on Ru(001) was studied utilizing work function change (Delta Phi), temperature programmed desorption (TPD), and supersonic atomic beam-collision-induced desorption (CID) measurements. A kinetic model that reproducesthe first bilayer growth, as determined by the Delta Phi measurements, wasdeveloped. It indicates that monomers dominate the cluster size distribution at low coverages, but at high coverages, tetramers gradually become the dominant clusters. Small contributions to Delta Phi suggest that tetramers are cyclic at the adsorbed state with inclined dipoles. CID measurements ofH2O and D2O at coverages near one bilayer reveal strong selectivity to theremoval of molecules in the A(2) adsorption sites over those in the icelike C sites and the A(1) sites. Soft removal rates of thicker ice layers as aresult of CID with energetic Kripton atoms were then studied as a functionof the ice layer thickness. Near the completion of the third bilayer, a sharp stabilization of the ice structure occurs, which leads to two concomitant effects: (a) a significant decrease in the CID removal rate of the ice layers, and (b) caging of adsorbed nitrogen followed by an extremely sharp desorption of the trapped molecules near 165 K. This happens at the onset ofthe ice desorption temperature. These effects are discussed in terms of the structure of the first layers of ice which grow on the surface of a Ru(001) single crystal and are consistent with recent model molecular dynamics simulations of such a system.

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Documento generato il 03/04/20 alle ore 07:54:51