Abstract
This paper presents the first low-energy, quasi-elastic He-atom scattering study of adsorbate atom diffusion. At 820 K sulfur adatoms segregated onto the close-packed (111) surface of a copper crystal at a rate ∼ 0.01 ML/h. These adatoms produce significant diffuse intensity of scattered He and, as evident from the quasielastic energy broadening, are highly mobile. The diffusion coefficient (D = 2.9 × 10-5 cm2 s-1) exhibits no surface coverage dependence, indicating relatively weak sulfur-sulfur interactions on the Cu(111) substrate.
Original language | English (US) |
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Pages (from-to) | 288-300 |
Number of pages | 13 |
Journal | Surface Science |
Volume | 259 |
Issue number | 3 |
DOIs | |
State | Published - Dec 2 1991 |
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Surfaces and Interfaces
- Surfaces, Coatings and Films
- Materials Chemistry