Darmstadt 2008 – scientific programme

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MO: Fachverband Molekülphysik

MO 7: Quantenkontrolle

MO 7.2: Talk

Tuesday, March 11, 2008, 14:15–14:30, 3F

Femtosecond Pump-DFWM Spectroscopy for the Investigation of the Dynamics of Higher Excited States — •Abraham Scaria, Vinu Namboodiri, Jakow Konradi, Jörg Liebers, Ulrich Kleinekathöfer, and Arnulf Materny — Jacobs University Bremen, Germany

Time resolved nonlinear four-wave mixing (FWM) techniques have become valuable tools to investigate dynamic properties of molecules. However until now, FWM techniques were only applied to investigate the dynamics of the ground state or the low lying excited states. Here, we demonstrate that by using an initial pump pulse followed by a time-resolved DFWM process, dynamics of higher lying excited states can be accessed and probed. Since iodine is well characterized by different spectroscopical techniques, it presents itself as an ideal model system for this study. In our experiments [1], the initial pump in the visible was chosen to be resonant with the ground to B state absorption of iodine while the DFWM beams were resonant with the B to ion-pair state transition. Applying different pulse sequences in the pump-DFWM scheme, wave packets on different potential energy surfaces could be prepared and their dynamics analyzed. In our contribution, we will present experimental results, where the dynamics of ion-pair states belonging to two different tiers were monitored and compared to quantum dynamical simulations. The simulations are detailed in a separate contribution.

[1] A. Scaria, V. Namboodiri, J. Konradi, and A. Materny, J. Chem. Phys. 127, 144305 (2007)