Berlin 2012 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 13: Poster: Interfaces and Thin Films

CPP 13.23: Poster

Dienstag, 27. März 2012, 18:15–20:45, Poster A

Freezing single molecule dynamics on interfaces and in polymers — •Felix Schmieder, Stefan Krause, and Christian von Borczyskowsi — Fakultät für Naturwissenschaften, Technische Universität Chemnitz, D-09107 Chemnitz

During the past decade, probing nano-scale fluctuations within materials by single molecule spectroscopy (SMS) has become a common method. As the observed emission spectra, fluorescence lifetime and polarization are always a result of intramolecular processes and environmental interactions, it is necessary to exactly know about the photophysics of the probe molecules. We report on the freezing of molecular dynamics of quasi-free molecules on surfaces upon lowering of temperature and embedding into a poly(methyl methacrylate) (PMMA) polymer. This has been investigated by measuring heterogeneous line broadening and spectral diffusion of fluorescence emission spectra by means of time dependent SMS using a home-built confocal laser scanning microscope. Thereby changes of optical transition energies could be observed as a result of both intramolecular changes of conformation and dynamics induced externally by the polymer matrix.