AG Wolf - Terahertz Spectroscopy - Einleitung

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Molecular switches on surfaces
Introduction

RESEARCH
Electron Dynamics
Surface Femtochemistry
Vibrational Spectroscopy
THz-Spectroscopy
Molecular Switches

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Prof. Dr. Martin Wolf
Abt. Physikalische Chemie
Fritz-Haber Institut der MPG
Faradayweg 4-6
14195 Berlin, Germany
phone:+49 30 8413-5111
Fax: +49 30 8413-5106

hitherto (2010):
Department of Physics
Free University Berlin
Arnimallee 14
D - 14195 Berlin

   



This project aims at a controlled, reversible modification of functional surface properties resulting from optical induced charge transfer between a semiconductor surface and adsorbed molecular switches. Time- and angle-resolved two-photon photoemission (2PPE) spectroscopy will be used to studmolswitchesy the electronic structure, electron dynamics and energetics of molecular switches (e.g. azobenzenes) on silicon surfaces. The verification of the switching process (conformational changes) will be carried out by means of vibrational spectroscopy via the characterization of the molecular orientation with high-resolution electron energy loss spectroscopy (HREELS) and/or vibrational sum frequency generation (SFG), respectively. This work is closely related to the field of molecular electronics, since the energetics, transport and dynamics of charge carriers at molecule/metal or semiconductor interface play an important rule in the future utilization of organic molecules as part of electronic devices. Furthermore, switching of functional surface properties are of interest in sensor technology.




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