| 隧道结电场辅助下叔丁胺分子在Cu(111)表面跳跃(英文) |
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| 引用本文： | 许逾群,仉君,袁秉凯,邓珂,杨蓉,裘晓辉.隧道结电场辅助下叔丁胺分子在Cu(111)表面跳跃(英文)[J].物理化学学报,2010,26(10):2686-2690. |
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| 作者姓名： | 许逾群 仉君 袁秉凯 邓珂 杨蓉 裘晓辉 |
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| 作者单位： | National Center for Nanoscience and Technology, Beijing 100190, P. R. China |
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| 基金项目： | 国家重点基础研究发展计划项目(973)，中国科学院知识创新工程项 |
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| 摘 要： | 采用扫描隧道显微镜(STM)于78 K研究了单个叔丁胺分子在Cu(111)表面的横向跃迁现象.研究发现叔丁胺分子的跳跃几率随隧道电流的增加而线性增加,这表明该过程是单电子激发过程;在不同极性的隧道结电场作用下,叔丁基胺分子跳跃行为发生的几率不同,这种现象可以用电场辅助的扩散过程解释.在不同极性电场作用下叔丁胺分子在Cu(111)表面的吸附能和扩散势垒不同,从而表现出不同的跳跃几率.
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| 关 键 词： | 扫描隧道显微镜 单分子 跳跃现象 电子激发 隧道结电场 |
| 收稿时间： | 2010-06-13 |
| 修稿时间： | 2010-09-27 |
Electric Field Assisted Hopping of Tert-Butylamine on Cu(111)Surface |
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| XU Yu-Qun,ZHANG Jun,YUAN Bing-Kai,DENG Ke,YANG Rong,QIU Xiao-Hui.Electric Field Assisted Hopping of Tert-Butylamine on Cu(111)Surface[J].Acta Physico-Chimica Sinica,2010,26(10):2686-2690. |
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| Authors: | XU Yu-Qun ZHANG Jun YUAN Bing-Kai DENG Ke YANG Rong QIU Xiao-Hui |
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| Institution: | National Center for Nanoscience and Technology, Beijing 100190, P. R. China |
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| Abstract: | The lateral hopping of tert-butylamine (t-BA) molecules on a Cu(lll) surface was studied by scanning tunneling microscopy (STM) at 78K.The hopping probabilities of the molecules in the tunneling junction were found to depend linearly on the applied tunneling current,indicating a single electron-induced process.Hopping probabilities under an electric field of opposite polarity was found to be different.This non-equivalence is attributed to an electric field assisted diffusion where the adsorption energy and the diffusion barrier of the t-BA molecule are different when the polar molecule is subjected to opposite electric fields. |
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| Keywords: | Scanning tunneling microscope Single molecule Hopping phenomenon Electronic excitation Electric field in a tunneling junction |
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