Barke I, Hövel H
University of Dortmund, Experimentelle Physik I, D-44221 Dortmund, Germany.
Phys Rev Lett. 2003 Apr 25;90(16):166801. doi: 10.1103/PhysRevLett.90.166801. Epub 2003 Apr 22.
Combining low-temperature scanning tunneling microscopy and spectroscopy with high-resolution ultraviolet photoemission, we have revealed a confined Shockley surface state on the (111) facets of gold clusters with about N=10(4) atoms grown in nanopits on highly oriented graphite. With tunneling spectroscopy, we observed energy dependent nodal patterns in the dI/dV maps, which are in quantitative agreement with the two-dimensional confinement of the surface state within the hexagonal facet area. The results indicate that the lattice of the ionic cores influences the electronic properties of the clusters significantly.
通过将低温扫描隧道显微镜和光谱学与高分辨率紫外光电子能谱相结合，我们揭示了在高度取向石墨上的纳米坑中生长的约含(N = 10^4)个原子的金簇（111）晶面上存在一种受限的肖克利表面态。利用隧道光谱，我们在(dI/dV)图中观察到了能量依赖的节点图案，这与表面态在六边形晶面区域内的二维限制在定量上是一致的。结果表明，离子芯的晶格对簇的电子性质有显著影响。
