Helmholtz-Zentrum Berlin für Materialien und Energie, Wilhelm-Conrad-Röntgen-Campus Adlershof, Elektronenspeicherring BESSY II, Albert-Einstein Str. 15, D-12489 Berlin, Germany.
Phys Chem Chem Phys. 2010 Sep 7;12(33):9867-71. doi: 10.1039/c004334f. Epub 2010 Jun 24.
Excitation-energy dependent Auger spectra of small copper clusters supported by a thin silica layer have been measured as function of cluster size. The Auger kinetic energy of the clusters clearly changes with the excess energy of the emitted photoelectron while not for the bulk. The kinetic energy shift is attributed to post-collision interaction (PCI) and exhibits a reduced metallic screening ability of small Cu-clusters. The spectroscopic data reveal an evolution from a long-range Coulomb-like interaction to a short-range "screened" electrostatic interaction within the sub-nm range. The data show that core electron spectroscopy such as PCI-Auger measurements can be used as a general tool to follow the metallic character of supported clusters.
已测量了负载在薄二氧化硅层上的小型铜簇的随激发能量变化的俄歇光谱，作为簇尺寸的函数。簇的俄歇动能明显随发射光电子的过剩能量而变化，而与体材料不同。动能位移归因于碰撞后相互作用（PCI），并表现出小型 Cu 簇的金属屏蔽能力降低。光谱数据揭示了在亚纳米范围内，从长程库仑型相互作用到短程“屏蔽”静电相互作用的演变。数据表明，核心电子光谱学，如 PCI 俄歇测量，可以用作跟踪负载簇的金属特性的通用工具。
