Reversible switching of tetra-tert-butyl-azobenzene on a Au(111) surface induced by light and thermal activation

被引:107
|
作者
Hagen, Sebastian [1 ]
Leyssner, Felix [1 ]
Nandi, Dhananjay [1 ]
Wolf, Martin [1 ]
Tegeder, Petra [1 ]
机构
[1] Free Univ Berlin, Fachbereich Phys, D-14195 Berlin, Germany
关键词
D O I
10.1016/j.cplett.2007.07.005
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Two-photon photoemission spectroscopy is employed to analyze reversible changes in the electronic structure of the molecular switch tetra-tert-butyl-azobenzene (TBA) adsorbed on Au(111), which are induced by UV-light and thermal activation. Cycles of illumination and annealing steps confirm the reversibility of the switching process, which we assign to a trans/cis-isomerization of TBA molecules in direct contact with the Au(1 11) surface. Pronounced changes in the photoelectron spectra due to UV-light exposure allow to calculate an effective cross section of sigma(eff) approximate to 8 x 10(-22) cm(-2) at. 4.14 eV and sigma(eff) approximate to 4 x 10(-21) cm(-2) at 4.4 eV, respectively, for the trans- to cis-isomerization. (c) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码:85 / 90
页数:6
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