Berlin 2014 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 13: Posters 3: Cold Molecules, Helium Nano Droplets, and Experimental Techniques

MO 13.25: Poster

Mittwoch, 19. März 2014, 16:30–18:30, Spree-Palais

Single-particle orbit tracking: A versatile tool for monitoring confined diffusion in nanoporous materials — •Dominic Raithel1, Daniel Zalami1, Dominique Ernst1, Uwe Gerken1, Jürgen Köhler1, and Markus Retsch21Lehrstuhl für Experimentalphysik IV Universität Bayreuth, 95447 Bayreuth, Deutschland — 2Lehrstuhl für Physikalische Chemie I Universität Bayreuth, 95447 Bayreuth, Deutschland

Diffusion and transport processes play an important role in many fields of natural and material sciences. An example is confined diffusion in nanoporous materials, as they are used in catalytic converters. Diffusion processes were generally studied with fluorescence-correlation spectroscopy (FCS) as well as single-particle tracking (SPT) methods using high sensitive CCD or CMOS cameras. We demonstrate a versatile SPT-technique, lately proposed by J. Enderlein [1], called single-particle orbit tracking (SPOT). With SPOT a single fluorescent particle is traced with the rotating focus of the excitation laser orbiting the particle. SPOT allows to follow a fluorescent polymer bead for several minutes with a temporal resolution of 4 ms and a position accuracy in the range of 10 nm [2]. With SPOT we are able to reconstruct the restricted trajectory of a fluorescent polymer bead within an inverse opal nanostructure, a 3-dimensional porous silica structure with cavities in the range of 100 nm. Due to the high spatial accuracy of the SPOT technique we can map the topology of the sample.

[1] J. Enderlein, Appl. Phys. B (71), 773-777 (2000) [2] D. Ernst et al., JOSA (29), 1277-1287 (2012)

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