One-dimensional defects in iodine adlayers on Pt(1 0 0)

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• 作者：Bjö ; rn Braunschweig ; Alexej Mitin ; Winfried Daum
• 关键词：STM ; Platinum ; One-dimensional ; Defects ; Iodine ; Adsorption
• 刊名：Surface Science
• 出版年：2009
• 出版时间：1 December 2009
• 年：2009
• 卷：603
• 期：23
• 页码：3361-3366
• 全文大小：1238 K

文摘

One-dimensional defect structures of closed-packed adlayers of iodine on Pt(1 0 0) were studied with scanning tunneling microscopy (STM). On the terraces of the Pt(1 0 0) surface we observed rotational domains with line defects running in [0 1 0] directions, in coexistence with nearly defect-free domains. In addition to these prevailing line defects (A-defects) with a local coverage lower than that of a defect-free surface, we report on much less frequently observed line defects with higher local coverages (B- and C-defects). The strong dependence of the concentration of these defects on the adsorption temperature is governed by the decrease of the overall iodine coverage with increasing temperature. Iodine adsorption at 1100 K leads to self-organization of A-defects in quasi-periodic arrangements. The relevance of these defects as important structural elements of commensurate superstructures of iodine on Pt(1 0 0) is stressed.