Hannover 2020 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 62: Control (joint session MO/Q)

Q 62.6: Talk

Friday, March 13, 2020, 15:15–15:30, f102

Setting the basis for a good Carrier Envelope Phase control — •Franziska Schüppel, Thomas Schnappinger, and Regina de Vivie-Riedle — Department Chemie, Ludwig-Maximilians-Universität München

Controlling the process of photo reactions is a major goal in chemistry. For synthetic application, for example, it is significant to have the desired product in the best possible yield. To achieve this, one approach is to apply a few-cycle IR laser pulse to a system in the vicinity of a conical intersection (CoIn).[1] This influences the system in a way to build a superposition between the states of interest. By changing the CEP (Carrier Envelope Phase) of the laser pulse, the superposition can be controlled to lead to the preferred transfer through the CoIn and by that to the preferred product.

In this theoretical work, we want to investigate the effectiveness of a CEP control on the basis of a dissociative model system. For that, we use quantum dynamic simulations with two coupled states in the adiabatic representation. We want to describe the interaction of the laser pulse, the transition dipole moment and the non-adiabatic coupling on the CEP control and find the basis needed for an effective control of a system. By changing the shape of the CoIn of the model system, we want to test the influence of a different topography on the CEP control.

[1] P. von den Hoff et al., IEEE J SEL TOP QUANT, 18 (2012), 119-129.