Dresden 2011 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 54: Particles and clusters I

O 54.3: Vortrag

Mittwoch, 16. März 2011, 15:30–15:45, WIL C307

Control of ultrafast photoinduced processes at graphene-supported metal clusters — •Kira Hinrichs, Mihai Vaida, and Thorsten Marco Bernhardt — Institute of Surface Chemistry and Catalysis, University of Ulm, Albert-Einstein-Allee 47, 89069 Ulm, Germany

A new experimental setup is presented which enables the control of the laser-induced photodissociation of molecules on graphene supported metal cluster nano-structures. Graphene is employed as a substrate providing a geometric template to obtain a regular array of clusters with equal size and distance for the investigation of field localization effects.

The temporal control of the processes at this system is archieved by photodissociation and detection of the adsorbed probe molecule methyl bromide via femtosecond laser pump-probe mass spectrometry with resonance enhanced multi-photon ionization.

For the additional spatial resolution the fate of the photodissociation products on the surface after the reaction is analyzed by scanning tunneling microscopy. The combination of methyl product mass spectrometry and local surface analysis opens new possibilities to optimize laser pulse shapes for enhanced photoreaction and selective field localization at the surface.