Abstract
The restructuring of S/W(111) surfaces has been studied using low-energy electron diffraction (LEED), Auger electron spectroscopy (AES), and scanning tunneling microscopy (STM). Dosing W(111) with a saturation coverage of H2S followed by annealing to > 800 K causes a substrate reconstruction with (4 × 4) periodicity. After the formation of the (4 × 4) structure over the entire surface, and upon further annealing, the terrace-step configurations also restructure and form triangular terraces. Upon heating to T > 1000 K, the triangular terraces coalesce and enlarge, in addition to forming multiple steps. A size-mismatch mechanism, based on charge transfer between S and W atoms, is proposed to explain the formation of (4 × 4) structures: strain introduced at the surface by adsorption of large sulfur anions is relieved by the (4 × 4) reconstruction. We have explored the consequences of a terrace growth mechanism for S(4 × 4)/W(111) that is based on local step structures, coupled with domain mismatch.
| Original language | English |
|---|---|
| Pages (from-to) | 254-260 |
| Number of pages | 7 |
| Journal | Surface Science |
| Volume | 433 |
| DOIs | |
| State | Published - 2 Aug 1999 |
| Event | Proceedings of the 1998 14th International Vacuum Congress(ICV-14), 10th Conference on Solid Surfaces(ICSS-10), 5th Conference on Nanometre-scale Science and Technology(NANO-5), 10th International Conference on Quantitative Surface Analysis(QSA-10) - Birmingham, UK Duration: 31 Aug 1998 → 4 Sep 1998 |