Fluorescence Spectroscopy on Molecules on Surfaces in the Limit of Low Coverages

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The aim of this project is to obtain information on organic molecules on dielectric surfaces from fluorescence (FL) and FL excitation spectroscopy in the limit of very low coverages. The project exploits the high spectral resolution and sensitivity of FL spectroscopy and intends to bring the experiments even to the single molecule detection level. The experiments will be performed on well-defined surfaces (NaCl/KCl(100)) with concomitant structural control by surface science techniques like low energy electron diffraction and scanning tunneling microscopy. It is supposed that such experiments will give information on the following aspects: (a) the electronic/geometric state of a molecule modified upon bonding to a dielectric surface, (b) the influence of different adsorption sites on the optical spectra and the question whether inhomogenous line broadening can be reduced by selective adsorption, e.g. at specific defect sites, (c) the kinetics of diffusion, site migration, and photochemical processes of a molecule on a surface, and finally, (d) for small molecular aggregates, a quantification of intermolecular coupling and its role for superradiant emission processes.