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Erlangen 2018 – scientific programme

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A: Fachverband Atomphysik

A 16: Atomic Clusters I (joint session A/MO)

A 16.2: Talk

Monday, March 5, 2018, 16:45–17:00, K 2.016

Rotating rotationless: nonadiabatic alignment of the helium dimer — •Maksim Kunitski1, Qingze Guan2, Stefan Zeller1, Dörte Blume2, and Reinhard Dörner11Institut für Kernphysik, Goethe-Universität Frankfurt am Main — 2Department of Physics and Astronomy, University of Oklahoma

Quantum mechanically rotational and vibrational dynamics in molecules is time evolution of corresponding wave packets. Such dynamics can be periodic, as well-known rotational and vibrational revivals with wave packets consisting of many coherently prepared bound states. How the rotational and vibrational dynamics would look like in a molecular system with a single bound state? One of such extreme quantum system is the helium dimer, where the two-body potential supports only one state.

We applied the nonadiabatic "kick" to the helium dimer by a femtosecond laser pulse (pump) and watched evolution of the system by Coulomb explosion imaging, which was initiated by the second much more intense delayed probe pulse. The observed time-dependent alignment of the helium dimer, as well as time evolution of the rovibronic wave packet, is going to be discussed.

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