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MO: Fachverband Molekülphysik

MO 30: Poster: Photochemistry

MO 30.1: Poster

Thursday, March 17, 2011, 16:00–18:00, P1

In situ X-ray scattering and differential reflectance spectroscopy (DRS) of molecular switches — •Sebastian Bommel, Christopher Weber, and Stefan Kowarik — Institut für Physik der Humboldt-Universität, 12489 Berlin, Deutschland

Molecular switches are a promising class of functional molecules on surfaces. Controlling the functional properties at an atomic scale opens a wide range of applications for molecular electronics, molecular sensing, smart surfaces and nanomachinery. We study the optically induced geometrical and spectral changes of molecular switches using in situ real-time x-ray scattering and Differential Reflectance Spectroscopy (DRS). We use a portable UHV organic molecular beam deposition (OMBD) system that has been optimized for small size, optical spectroscopy and in situ x-ray scattering in order to measure the Gracing Incidence X-ray Diffraction (GIXD) pattern before and after switching the molecules. This allows us to compare the switching behavior of the molecular classes of azobenzenes, cyclopentene and maleimid.