Bonn 2025 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 25: X-ray Spectroscopy

MO 25.6: Vortrag

Donnerstag, 13. März 2025, 16:00–16:15, HS XVI

Ultrafast molecular ion dynamics illuminated by soft X-ray spectroscopy — •Simon Reinwardt¹, Alexander Perry-Sassmannshausen², Ticia Buhr³, Alfred Müller², Stefan Schippers², Florian Trinter⁴, and Michael Martins¹ — ¹Universität Hamburg, Hamburg, Germany — ²Justus-Liebig-Universität Gießen, Gießen, Germany — ³Deutsches Elektronen-Synchrotron (DESY), Hamburg, Germany — ⁴Fritz-Haber-Institut, Berlin, Germany

Synchrotron radiation has turned out to be a very powerful tool to study molecular dynamics of small molecules [1]. Photoexcitation is an instructive technique that facilitates the investigation of ultrafast dissociation processes on a time scale similar to lifetime of Auger decay [2]. Using the photon-ion merged-beams technique, implemented at the Photon-Ion Spectrometer at PETRA III (DESY, Hamburg), we measured the kinetic energy release of molecular ions depending on the photon energy [3]. Thereby, the ultrafast dynamics of the photodissociation process of molecular ions NH⁺ and OH⁺ was revealed particularly as a result of 1s → π^∗ and 1s → σ^∗ excitations.

• [1] J. D. Bozek and C. Miron, J. Electron. Spectrosc. Relat. Phenom. 204, 269 (2015).
• [2] O. Travnikova et al., Phys. Rev. Lett. 116, 213001 (2016).
• [3] M. Martins et al., J. Phys. Chem. Lett. 12, 1390 (2021).

Keywords: Soft X-ray