Diffusive atom transport along step edges on Ag(111) at 295 K
| Autor: | Rainer G. Ulbrich, N. Quaas, Martin Wenderoth |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
Surface diffusion
Monatomic gas Chemistry Diffusion Relaxation (NMR) 02 engineering and technology Surfaces and Interfaces Edge (geometry) 021001 nanoscience & nanotechnology Condensed Matter Physics 7. Clean energy 01 natural sciences Molecular physics Surfaces Coatings and Films law.invention Surface tension law 0103 physical sciences Atom Materials Chemistry Physical chemistry Scanning tunneling microscope 010306 general physics 0210 nano-technology |
| Zdroj: | Surface Science. 550:57-64 |
| ISSN: | 0039-6028 |
| DOI: | 10.1016/j.susc.2003.12.021 |
| Popis: | The entropy-driven relaxation of a unique, non-equilibrium step edge configuration on the Ag(1 1 1) surface was observed using time-resolved STM imaging at room temperature. Using the Gibbs–Thomson relation, the relaxation process is quantitatively described as diffusive mass transport in terms of a gradient in the chemical potential along the monoatomic step edge. The STM data directly show that mass transport on Ag(1 1 1) is dominated by step edge diffusion at 295 K, and allow an estimate of the corresponding effective energy barrier. We obtain E eff =0.49±0.05 eV and compare this value with recent results on island diffusion studies. |
| Databáze: | OpenAIRE |
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