Hannover 2010 – scientific programme

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SYQS: Symposium Quantum Control Spectroscopy

SYQS 1: Quantum Control Spectroscopy I

SYQS 1.1: Invited Talk

Thursday, March 11, 2010, 10:30–11:00, E 415

Theoretical studies on quantum control and spectroscopy of ultrafast photoreactions — •Regina de Vivie-Riedle¹, Judith Voll¹, Artur Nenov¹, Tiago Buckup², Jürgen Hauer², and Marcus Motzkus² — ¹LMU Department Chemie, Butenandt-Str. 11, 81377 München, Germany — ²Physikalische Chemie, Ruprecht-Karls-Universität Heidelberg, 69120 Heidelberg

We are interested in the spectroscopy and control of ultrafast photoreactions, key elements in chemical and biological processes. We approach this topic from the quantum chemical and quantum dynamical side. Often a seam of conical intersections provides the locus for the ultrafast transfer between electronic states and thus the topography experienced by the ongoing reaction. Features decisive for a photoreaction will be illustrated by a calculated complete seam. Possible reaction pathways are classified as well as routes for optical control. Pulse sequences as optimal light fields often emerged in experimental as well as in theoretical studies. Their excitation mechanism is explored using the example of an open quantum system set up in the density formalism and adapted to the experimentally investigated beta carotene [1]. We discuss and explain the effect of the individual pulse parameters [2], relate them to the system response and outline a strategy for the use of pulse trains in spectroscopy and signal processing.

[1] J. Hauer et al.,Chem. Phys. Lett., 421, (2006) 523.

[2] J. Voll et al., New J. Phys., 11 (2009), 105036.