G. Zumofen, J. Hohlbein, and C.G. Hübner, Physical Review Letters, 93, 260601, 2004, [link]
We report on ﬂuorescence ﬂuctuations of nanoparticles diffusing through a laser focus. Subject to an intensity threshold the ﬂuorescence signal is transformed into time traces of on and off periods. The distribution functions of the experimental on and off times follow power laws t^-alpha over several orders of magnitude with exponents alpha equal 1.5-2. At long times the distribution functions cross over to exponential decays. For the interpretation of the experimental data a diffusion-reaction equation is proposed which covers both, the diffusion controlled recurrence and the photon statistics as the relevant processes.