SAMOP 2023 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 13: Poster II

MO 13.4: Poster

Mittwoch, 8. März 2023, 16:30–19:00, Empore Lichthof

Ultrafast spectroscopy of intramolecular dynamics and photodissociation of a single trapped molecular ion — •Zhenlin Wu, Brandon Furey, Stefan Walser, Guanqun Mu, René Nardi, and Philipp Schindler — Institut für Experimentalphysik, Universität Innsbruck, Innsbruck, Austria

Trapped atomic ions are one of the most promising platforms for quantum simulation and quantum computation. By co-trapping molecular ions with atomic ions, quantum logic spectroscopy can be performed to investigate the rovibrational structure of various molecular species, as demonstrated recently with diatomic molecular ions including CaH⁺ and N₂⁺. In a similar system, we plan to explore ultrafast intramolecular dynamics in complicated polyatomic molecular ions with femtosecond laser pulses. In particular, we will measure the net momentum transfer of the pump and the delayed probe pulse. Such momentum change can be detected by preparing the common motion of the ion crystal in a non-classical state. With this scheme, we aim to study the evolution of vibrational excitations inside a single polyatomic molecule of chemical or biological importance.

We are currently investigating the interaction between ultrafast laser pulses and molecular ions by measuring the photodissociation threshold of CaOH⁺. The molecules are generated by chemical interactions between trapped Ca⁺ ions and water molecules that can be introduced with a gate valve into the main experimental chamber. After the reaction, a Ca⁺ ion turns “dark” and femtosecond laser pulses with variable wavelength are applied to dissociate it back to a “bright” Ca⁺ ion.