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Accueil > Séminaires > Année 2023 > Séminaire de Miriam Kappe (17 oct)

Séminaire de Miriam Kappe (17 oct)

University of Innsbruck, Austria

par Martrenchard-Barra Séverine - 24 septembre 2023

Messenger Spectroscopy using Superfluid Helium Nanodroplets

Recording absorption spectra of cold ions in the gas phase is a challenging task. It can be tackled by messenger spectroscopy using helium atoms as weakly interacting tags. In our group we are able to produce helium tagged cations as well as anions by charging and subsequently doping large helium nanodroplets. Ions are released from the large droplets either via surface collision1 or by evaporation of the droplets through collisions with room temperature helium gas2. The helium tagged ions are then detected in a time-of-flight mass spectrometer. Changes in the ion yield after excitation with a tunable pulsed laser are recorded as a function of the laser wavelength, which results in the absorption spectrum of the investigated helium tagged ion species. In the past years we have concentrated on the investigation of polycyclic aromatic hydrocarbons, since, due to their higher stability compared to other classes of carbonaceous molecules, PAHs could be promising candidates for DIB carriers.3,4,5

This work was supported by the Austrian Science Fund, FWF, via projects I4130 and I6221.
References
1. P. Martini, et al. PRL 2021, 127(26), 263401.
2. S. Bergmeister, et al. Rev. Sci. Instrum., 2023, 94(5)
3. M. Meyer, et al. APJ, 2021, 913(2), 136.
4. M. Kappe, et al. A&A, 2023, 672.
5. M. Kappe, et al. Molec. Phys., 2023, e2202271

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