Berlin 2008 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 8: POSTERS Dynamics and Diffusion

CPP 8.8: Poster

Montag, 25. Februar 2008, 16:45–19:00, Poster A

Simulation of 3-Pulse Photon Echo with finite pulses — Wichard Beenken and •Ines Mynttinen — Technische Universität Ilmenau, Fachgebiet Theoretische Physik I

We performed computational simulations of the three-pulse photon echo experiments on Nile-blue as a reference. Our aim is to go beyond the impulsive limit and simulate the effect of a finite duration of the incoming laser pulses. As a first result we could show that the peak shift, i.e. the value of the first delay time where the photon echo is maximum, does not depend linearly on the pulse duration. This complicates the extrapolation of the peak shift to the impulsive limit, where it should theoretically resemble the two-point time correlation function for the fluctuating optical gap M(t). We will show how and up to which degree of time resolution from three-pulse photon echo experiment with finite pulse duration the correlation function M(t), which reflects the dissipative dynamics of the molecule in its environment, can be achieved by computational simulations of the signal dependence on the delay times. Furthermore we will discuss the sophisticated interplay between the intrinsic inhomogeneity of the molecule ensemble and the Fourier-limited spectral width of the incoming laser pulses in three-pulse photon echo experiments.