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Vibrational Spectroscopy
 

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

   
Time-resolved spectroscopy of surface processes: Basic concept

Our goal is to resolve the time evolution of reaction directly at the surface and to capture short-lived reaction intermediates in ultrafast surface reactions. As a basic concept we employ a pump-probe approach using surface and molecule specific spectroscopy (see schematic diagram below). An intense femtosecond laser pulse ('pump' pulse) starts a reaction of adsorbed molecules at a surface. The resulting changes in the electronic or vibrational properties of the adsorbate substrate complex are monitored at later times by a second ultrashort probe pulse. Here we employ the technique of non-linear infrared-visible sum-frequency generation (SFG) as a time-resolved 'probe'.

Principle of SFG | Hot-band excitation | CO Desorption

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