Berlin 2005 – wissenschaftliches Programm
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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.