Han Patrick, Mantooth Brent A, Sykes E Charles H, Donhauser Zachary J, Weiss Paul S
Department of Chemistry, The Pennsylvania State University, 104 Davey Laboratory, University Park, Pennsylvania 16802-6300, USA.
J Am Chem Soc. 2004 Sep 1;126(34):10787-93. doi: 10.1021/ja049113z.
Low-temperature scanning tunneling microscopy has been used to characterize the various structures of submonolayer and near-monolayer coverages of benzene (C6H6) on Au[111] at 4 K. At low coverage, benzene is found to adsorb preferentially at the top of the Au monatomic steps and is weakly adsorbed on the terraces. At near-monolayer coverage, benzene was found to form several long-range commensurate overlayer structures that depend on the regions of the reconstructed Au[111] surface, namely a (radical 52 x radical 52)R13.9 degrees structure over the hcp regions and a (radical 133 x radical 133)R17.5 degrees "pinwheel" structure over the fcc regions. Time-lapse imaging revealed concerted cascade motion of the benzene molecules in the (radical 133 x radical 133)R17.5 degrees pinwheel overlayer. We demonstrate that the observed cascade motion is a result of concerted molecular motion and not independent random motion.
低温扫描隧道显微镜已被用于表征4K下苯（C6H6）在Au[111]上亚单层和近单层覆盖的各种结构。在低覆盖度下，发现苯优先吸附在Au单原子台阶的顶部，并在台面上弱吸附。在近单层覆盖度下，发现苯形成了几种取决于重构Au[111]表面区域的长程共格覆盖层结构，即在hcp区域上形成一个（√52×√52）R13.9°结构，在fcc区域上形成一个（√133×√133）R17.5°“风车”结构。延时成像揭示了苯分子在（√133×√133）R17.5°风车覆盖层中的协同级联运动。我们证明，观察到的级联运动是协同分子运动的结果，而不是独立的随机运动。
