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Investigators at University of Leipzig Discuss Findings in Chemical Physics

May 27, 2014

By a News Reporter-Staff News Editor at Physics Week -- Data detailed on Chemical Physics have been presented. According to news reporting originating in Leipzig, Germany, by VerticalNews journalists, research stated, "Fluorescence intermittency is a random switching between emitting (on) and non-emitting (off) periods found for many single chromophores such as semiconductor quantum dots and organic molecules. The statistics of the duration of on- and off-periods are commonly determined by thresholding the emission time trace of a single chromophore and appear to be power law distributed."

The news reporters obtained a quote from the research from the University of Leipzig, "Here we test with the help of simulations if the experimentally determined power law distributions can actually reflect the underlying statistics. We find that with the experimentally limited time resolution real power law statistics with exponents alpha(on/off) 7 1.6, especially if alpha(on) not equal alpha(off) would not be observed as such in the experimental data after binning and thresholding. Instead, a power law appearance could simply be obtained from the continuous distribution of intermediate intensity levels."

According to the news reporters, the research concluded: "This challenges much of the obtained data and the models describing the so-called power law blinking."

For more information on this research see: Distortion of power law blinking with binning and thresholding. Journal of Chemical Physics, 2014;140(11):187-194. Journal of Chemical Physics can be contacted at: Amer Inst Physics, Circulation & Fulfillment Div, 2 Huntington Quadrangle, Ste 1 N O 1, Melville, NY 11747-4501, USA. (American Institute of Physics -; Journal of Chemical Physics -

Our news correspondents report that additional information may be obtained by contacting N. Amecke, University of Leipzig, Inst Expt Phys 1, Mol Nanophoton Grp, D-04103 Leipzig, Germany. Additional authors for this research include A. Heber and F. Cichos.

Keywords for this news article include: Europe, Leipzig, Germany, Power Law, Chemical Physics

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Source: Physics Week

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