Berlin 2012 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 15: Poster: New Instruments and Methods

CPP 15.5: Poster

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

Impurity Spectroscopy at its Ultimate Limit: Relation between Bulk Spectrum and the Distributions of Individual Parameters of (Nearly) All Dopant Molecules in Solids — Andrei V. Naumov¹, Aleksey A. Gorshelev¹, Yury G. Vainer¹, •Lothar Kador², and Jürgen Köhler² — ¹Molecular Spectroscopy Department, Institute for Spectroscopy, Russian Academy of Sciences, Troitsk, Moscow reg., 142190, Russia — ²University of Bayreuth, Institute of Physics and Bayreuther Institut für Makromolekülforschung (BIMF), 95440 Bayreuth, Germany

We recorded the fluorescence excitation spectra of a substantial fraction of all single chromophore molecules (hundreds of thousands and more) in solid bulk samples. The complete spectra and the spatial coordinates of all chromophores were stored for further analysis. In this way it is possible to study a bulk sample in a broad spectral region given by the inhomogeneous width of the electronic transition with ultimate sensitivity, combining excellent statistical accuracy and the capability of detecting rare events. From the raw data, the distributions of a number of parameters of the chromophore spectra were extracted, including the frequencies of the zero-phonon lines, their linewidths, and fluorescence count rates. Relationships between these distributions and the disorder of the matrix were established for the examples of two polycrystalline matrices of very different properties, n-hexadecane and o-dichlorobenzene, and the amorphous polymer polyisobutylene. Spatially inhomogeneous distributions of some parameters were found.