Heidelberg 2015 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 16: Posters 3: Novelties in Molecular Physics

MO 16.21: Poster

Mittwoch, 25. März 2015, 17:00–19:00, C/Foyer

Versatile concepts in cryo-spectroscopy of isolated metal clusters and complexes — •Jonathan Meyer, Thomas Kolling, and Gereon Niedner-Schatteburg — Technische Universität Kaiserslautern, Germany

We aim to combine cryogenically cooled ion traps with laser spectroscopy as a powerful tool to probe the structure and dynamics of metal cluster ions and their interaction with adsorbed molecules. The clusters are generated either in a laser vaporization source or an electrospray ion source, guided by a hexapole, mass selected by a quadrupole and stored in a hexapole ion trap. By using pulses of cold buffer gas (ca. 4K), the investigated species can be cooled down to their vibrational ground state. Action spectroscopy based on tagging the investigated species with rare gas atoms or other weakly bound messenger molecules enables spectroscopy of otherwise inaccessible vibrational and rotational modes. In case of resonant absorption the messenger atom or molecule can then be detached, which leads to a detectable change in the resulting mass spectrum taken by by a reflectron time of flight mass spectrometer. The value of this type of scheme has been shown by Jasik et al. [1] and our own group [2]. Two different spectroscopic schemes for high resolution one color IR spectroscopy and for a non resonant simulated raman process are discussed.

[1] J. Jasík et al., International Journal of Mass Spectrometry 354-355 (2013) 204-210

[2] Dillinger, S., Mohrbach, J., Hewer, J., Gaffga, M., Niedner-Schatteburg, G., manuscript in preparation, 2015