Hannover 2013 – scientific programme

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MO: Fachverband Molekülphysik

MO 18: Experimental Techniques

MO 18.1: Talk

Wednesday, March 20, 2013, 14:00–14:15, F 102

Photon economy considerations for pump-probe spectroscopy — •Gerald Ryseck and Peter Gilch — HHU Düsseldorf, AG Femtosekundenspektroskopie, Universitätsstr. 1, 40225 Düsseldorf

Pump-probe techniques are commonly applied to achieve high time resolution in ultrafast spectroscopy of physical and chemical processes. The time evolution of the derived signals can for the most part be described by a superposition of exponential decays. One aim is to estimate the involved rate constants with a defined accuracy. One fundamental result of parameter estimation theory is the Cramér-Rao lower bound [1] giving a limit for the lowest variance of the estimator. Even though applied for photon counting measurements [2] similar consideration for pump probe setups are lacking. We here present our findings for this case and discuss the choice of time delays giving the highest information on the decay.

[1] H-O Georgii, "Stochastik", Walter de Gruyter, Berlin, 2004

[2] M Köllner, J Wolfrum, Chem Phys Lett, (1992) 200, 1-2, 199-204