Freiburg 2024 – scientific programme

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MO: Fachverband Molekülphysik

MO 7: Poster: Spectroscopy

MO 7.4: Poster

Tuesday, March 12, 2024, 17:00–19:00, Tent C

Combination of action-based interferometric measurements with depletion spectroscopy — •Leonie Werner, Ulrich Bangert, Yilin Li, Arne Morlok, Lukas Bruder, and Frank Stienkemeier — University of Freiburg, Institute of Physics, Hermann-Herder-Straße 3, 79104 Freiburg im Breisgau, Germany

Isolation spectroscopy in ultracold helium nanodroplets enables the investigation of single and multiple embedded organic molecules in a cold, weakly perturbing environment [1]. In our lab, we combine this method with interferometric techniques, such as wave packet interferometry (WPI) and two-dimensional electronic spectroscopy (2DES) [2, 3]. This allows us to achieve high temporal and energy resolution at the same time. Standard detection techniques are laser-induced fluorescence or photoionization. Yet, these methods have problems to capture non-radiative photochemical processes or pose a challenge in overcoming the high ionization potentials of organic molecules. To solve these issues, we are exploring beam depletion detection methods [1]. First tests will be presented.

[1] J. P. Toennies and A. F. Vilesov, Angew. Chem. Int. Ed. 43, 2622 (2004).

[2] L. Bruder et al., Nat. Commun. 9, 4823 (2018).

[3] L. Bruder et al., J. Phys. B 52, 183501 (2019).

Keywords: depletion spectroscopy; cluster isolation spectroscopy; wave packet interferometry; photochemical reaction; azobenzene