Anomalous Lineshapes and Aging Effects in Two-Dimensional Correlation Spectroscopy

Details Anomalous Lineshapes and Aging Effects in Two-Dimensional Correlation Spectroscopy Anomalous Lineshapes and Aging Effects in Two-Dimensional Correlation Spectroscopy

2007-09-08

arxiv.org/abs/0709.1221v1

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1063/1.2793786

Multitime correlation functions provide useful probes for the ensembles of trajectories underlying the stochastic dynamics of complex systems. These can be obtained by measuring their optical response to sequences of ultrashort optical pulse. Using the continuous time random walk model for spectral diffusion, we analyze the signatures of anomalous relaxation in two-dimensional four wave mixing signals. Different models which share the same two point joint probability distribution show markedly different lineshapes and may be distinguished. Aging random walks corresponding to waiting time distributions with diverging first moment show dependence of 2D lineshapes on initial observation time, which persist for long times.

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