Reconstruction On Au(001) Vicinal Surfaces In Uhv And In Sulfuric Acid Solution

摘要

Using scanning tunneling microscopy we have studied the reconstruction on Au(11n) surfaces in ultra-high vacuum and in electrolyte. Similar to the well-known (5×20) quasi-"hex" reconstruction on Au(001), the reconstruction consists of parallel reconstruction lines along the steps indicative of a higher atom density in the first Au layer. In contrast to nominally flat Au(001) where the reconstruction period is 1.44 nm, we find considerably larger reconstruction periods (1.8-1.96 nm) on incidentally flatter regions of nominal Au(119), Au(1111), and Au(1117) surfaces. The enlarged reconstruction period is attributed to the stress field on stepped surfaces. In agreement with previous studies we find a reconstruction free zone at the step edges.