Topography Multiplicity of Titanyl Phthalocyanine on Ultrathin Insulating Films Observed by STM  

作　　者：YUAN Bing-Kai CHEN Peng-Cheng ZHANG Jun DENG Ke CHENG Zhi-Hai WANG Chen 袁秉凯;陈鹏程;仉君;邓珂;程志海;王琛(National Center for Nanoscience and Technology,Beijing 100190)

机构地区：[1]National Center for Nanoscience and Technology,Beijing 100190

出　　处：《Chinese Physics Letters》2013年第10期139-142,共4页中国物理快报（英文版）

基　　金：Supported by the National Basic Research Program of China(2012CB933001);the National Natural Science Foundation of China(21173058,21203038).

摘　　要：Individual titanyl phthalocyanine(TiOPc)molecules on ultrathin sodium chloride striped films grown on Cu(110)exhibit two different topographies with 8-lobes and 6-lobes when imaged by scanning tunneling microscopy(STM).Direct images of the molecular orbitals of the molecules with 8-lobes are obtained,indicating that the electronic structure of the TiOPc molecule are decoupled from the metallic substrate.For the TiOPc molecule with 6-lobes,the STM images at negative and positive bias polarities show the same structures as 2-fold symmetry except for the 90°rotation with respect to each other.This phenomenon may be attributed to the splitting of the two former degenerate lowest unoccupied molecular orbitals due to the negative charging of the molecule.The identification of the molecular orbital splitting on the ultrathin insulating layer could deepen the understanding of the intrinsic properties of semi-conducting molecules.

关 键 词：SPLITTING cyanine attributed 

分 类 号：O17[理学—数学]