Stuttgart 2012 – scientific programme

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MO: Fachverband Molekülphysik

MO 6: Femtosecond Spectroscopy I

MO 6.7: Talk

Monday, March 12, 2012, 18:00–18:15, V38.03

Carrier envelope phase controlled dynamics at conical intersections — •Robert Siemering, Philipp von den Hoff, and Regina de Vivie-Riedle — Department Chemie Ludwig-Maximilians-Universität München, Butenandtstr. 11, Haus E, 81377 München, Germany

We investigate how ultrafast dynamics at conical intersection can be combined with laser control schemes. Therefore we study the effect of the non-adiabatic-coupling for wavepackets approaching the conical intersection from different directions and different momenta in model systems. These two dimensional model systems are set up in the g/h-plane (branching space) of the conical intersection between two potential energy surfaces. We analyse the relationship between transfer efficiency and the initial conditions of the wavepacket. Based on these results we develop a control scheme that relies on the carrier envelope phase of the control laser pulse. The control scheme includes the creation of an electronic superposition state before the wavepacket reaches the conical intersection. The control landscape is enhanced by applying optimal control strategies. To optimize carrier envelope phase control within optimal control theory we used its phase sensitive variant.