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CPP: Chemische Physik und Polymerphysik

CPP 12: Selforganized and supramolecular assemblies I

CPP 12.4: Vortrag

Montag, 7. März 2005, 10:30–10:45, TU C243

Spectroscopy of Individual J-Aggregates — •Erwin Lang¹, Sasha Sorokin², Yuri Malyukin², and Jürgen Köhler¹ — ¹Experimental Physics IV, University of Bayreuth, Germany — ²Institute for Single Crystals, National Academy of Science, Ukraine

It is well known that J-aggregates, consisting of hundreds of non-covalently bound molecules in linear or cylindrical arrangement, show strong optical transitions in the visible spectral range. This feature makes them promising candidates for artificial light-harvesting systems and strongly luminescent nanoparticles.

We will present fluorescence-excitation spectra of individual J-aggregates from amphiphilic-carbocyanine molecules. The spectra, recorded at various temperatures and as a function of the polarisation of the incident radiation, show a pronounced temporal and spatial heterogeneity. In combination with structural data obtained from cryo-electron microscopy we will discuss different models for the electronic structure of the investigated J-aggregates.