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MO: Fachverband Molekülphysik
MO 11: X-ray Spectroscopy
MO 11.5: Vortrag
Mittwoch, 13. März 2024, 12:00–12:15, HS 3044
Soft X-Ray-induced Dimerization of Methane — •Simon Reinwardt1, Ivan Baev1, Patrick Cieslik1, Karolin Baev2, Ticia Buhr3, Alexander Perry-Sassmannshausen3, Stefan Schippers3, Alfred Müller3, Florian Trinter4, Jens Viefhaus5, and Michael Martins1 — 1Universität Hamburg, Hamburg, Deutschland — 2Deutsches Elektronen-Synchrotron, Hamburg, Deutschland — 3Justus-Liebig-Universität Gießen, Gießen, Deutschland — 4Fritz-Haber-Institut, Berlin, Deutschland — 5Helmholtz-Zentrum Berlin für Material und Energie, Berlin, Deutschland
Carbon 1s photo excitation of methane, CH4 and subsequent multimerization in CH4 gas has been studied using the PIPE ion-trap setup [1] at PETRA III of DESY. Photoions resulting from the decay of the 1s vacancy are stored within the ion trap so that they can undergo reactions with the surrounding neutral methane molecules. The experimental results clearly show that the initial photoionization event leads to the formation of reaction products with up to three carbon atoms [2]. Accordingly, such addition reactions can play an important role in the formation of larger molecular ions in planetary ionospheres. A better understanding of photoinduced reactions forming larger molecules is essential for understanding the chemistry and chemical composition of atmospheres such as those of exoplanets, whose investigation is planned with celestial observatories like the James Webb Space Telescope.
[1] S. Reinwardt et al., Rev. Sci. Instrum. 94, 023201 (2023).
[2] S. Reinwardt et al., Astrophys. J. 952, 39 (2023).
Keywords: Soft X-Ray; Methane; Synchrotron; Photoionization; Ionosphere