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It has been found that the Ag adsorbate forms a dilute chain structure on the Ta(211) surface upon heating to 600K. Ag atomic chains are arranged along the [111] direction of the substrate and occupy every second hollow row typical of this surface. In contrast, Au heated to 1000K is likely to produce a surface alloy with the substrate. The obtained STM results show that terrace edges of the clean...
We have studied how oxygen adsorbed on top of the uniform height Pb islands, (grown on Si(111)-(7x7) at low temperatures T l <190 K) extends the temperature range of their stability. The evolution of the island height and size with temperature is monitored with SPA-LEED. The presence of oxygen suppresses Pb diffusion to higher levels and results in sharper island height distribution, when...
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