Regensburg 2010 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 31: Poster: Polymer Dynamics

CPP 31.10: Poster

Mittwoch, 24. März 2010, 17:30–19:00, Poster C

Spectral Diffusion Probing Nanoscale Fluctuations — •Stefan Krause, Daniela Täuber, and Christian von Borczyskowski — Center for Nanostructured Materials and Analysis, Chemnitz University of Technology D-09107 Chemnitz, Germany

Since the first single molecule experiments spectral diffusion is known to occur for almost every single emitter. The reason for this photophysical phenomenon can either be related to intrinsic changes of the conformation of a single molecule which is in most cases not rigid but exhibits different states or to changes of the surrounding environment and the resulting reorientation of environmental dipoles. Thus spectral fluctuations can at one hand give insight into the dynamic process of conformational changes and at the other hand probe dynamical processes in condensed matter on the nanometer scale. Here we present results of our investigation on various types of single molecule in different environments such as polymers and on SiO2 surfaces. We use a homebuilt confocal laser scanning microscope and spectroscopy setup to detect spectral dynamics. The extracted data are analysed and interpreted with a model very similar to that used for two dimensional spatial diffusion processes revealing clear correlations between the types of environment and the degree of spectral fluctuations.