期刊
SURFACE SCIENCE
卷 643, 期 -, 页码 183-189出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.susc.2015.08.028
关键词
Self-assembled monolayers; Charge transfer; Core-hole clock; Time-resolved photoemission; Molecular switches
资金
- Helmholtz Virtual Institute Dynamic Pathways in Multidimensional Landscapes
- [Sfb 658]
We have studied the charge-transfer dynamics in azobenzene-functionalized alkanethiolate self-assembled monolayers. We compare the core-hole-clock technique, i.e., resonant vs. non-resonant contributions in the azobenzene autoionization of the Cls-pi* core exciton, with the lifetime of a molecular resonance determined by two-photon photoemission spectroscopy using femtosecond laser pulses. Both techniques yield comparable charge-transfer times of 80 +/- 20 fs for a linker consisting of three CH2 groups and one oxygen unit. Thus the quenching of the excitation is about one order of magnitude faster than the time required for the trans to cis isomerization of the azobenzene photoswitch in solution. (C) 2015 Elsevier B.V. All rights reserved.
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