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Münster 1999 – scientific programme

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CP: Chemische Physik

CP 21: Einzelteilchenspektroskopie

CP 21.4: Talk

Thursday, March 25, 1999, 10:45–11:00, Gg

Terrylene in p-terphenyl: A model system for single molecule microscopy and spectroscopy at room temperature. — •Bert Hecht, Ludovic Fleury, Beate Sick, Gert Zumofen, and Urs P. Wild — Physical Chemistry Laboratory, Swiss Federal Institute of Technology, ETH-Zentrum, CH-8092 Zurich, Switzerland

Single molecules of terrylene in a crystalline host (p-terphenyl)

show a very small average photobleaching quantum efficiency of

less than 1.2 · 10−8 at room temperature [1]. This

property allows to study the physics of a single quantum

system at room temperature without the need of averaging over

many single systems or long integration times to get enough

signal-to-noise ratio. Such averaging often leads to a loss of

information. Fluorescence spectra and fluorescence photon

emission statistics of single terrylene molecules have been

studied using a scanning confocal optical microscope. We observe

characteristic fluorescence spectra of single terrylene

molecules as well as antibunching and bunching in the stream of

fluorescence photons.

[1] High photo-stability of single molecules in an organic

crystal at room temperature observed by scanning confocal

optical microscopy, L. Fleury, B. Sick, G. Zumofen,

B. Hecht and U.P. Wild, to appear in Molecular Physics

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