| Autor: |
U. van Slooten, Arjen Bot, Wim R. Koppers, Joost W. M. Frenken, A M C Moutinho, Aart W. Kleyn, H.M. van Pinxteren |
| Jazyk: |
angličtina |
| Rok vydání: |
1993 |
| Předmět: |
|
| Zdroj: |
Journal of Physics: Condensed Matter, 5(31):006, 5411-5428. IOP PUBLISHING LTD |
| ISSN: |
0953-8984 |
| Popis: |
The growth behaviour of barium on silver(111) at room temperature is investigated by AES, XPS, MEIS, TDS, work function measurements and by monitoring the secondary-electron-emission crystal current. It is shown that, for low coverage, initially a 2D monolayer is formed. For higher coverages the overlayer formed resembles a structure formed by Poisson or Stranski-Krastanov growth with small islands. As evaporation continues the islands become very large or the sticking coefficient drops to zero. Annealing the Ag with more than one monolayer of Ba on top shows a large work function decrease of 0.6 eV to an unusually low value of 1.9 eV. The lowering of the work function can partly be explained by the formation of large clusters. Coadsorption experiments with H2 indicate that the H2 sticking coefficient on Ba/Ag(111) is constant and that the H2 adsorbs dissociatively into one binding state. From the experiments an inelastic mean free path of 11+or-1 AA for 351 eV electrons and 17+or-1 AA for 1113 eV and 1119 eV electrons is deduced. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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