Mainz 2017 – scientific programme

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MO: Fachverband Molekülphysik

MO 9: Posters 1: Dichroism, VUV and Xray, Clusters, and Cold Molecules

MO 9.17: Poster

Tuesday, March 7, 2017, 17:00–19:00, P OG1

Towards high resolution spectroscopy of biomolecular ions in a cryogenic multipole ion trap — •Felix Duensing, Steffen Spieler, Lena Remmers, Moritz Fischer, Katharina Geistlinger, and Roland Wester — Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck, Österreich

High resolution spectroscopy is a versatile method to study molecular structures [1]. At room temperature many close lying rovibrational states are populated, which can make the interpretation difficult. Several biomolecular ionic complexes have already been investigated in combination with buffer gas cooling [2,3]. Our approach combines spectroscopy of charged biomolecular systems and weakly bound clusters with high resolution far-infrared techniques in a radio frequency ion trap setup similar to Ref. [4]. With quadrupole guides and filters we are able to load ions mass selectively in a 16-pole wiretrap cooled to below 4 K. Buffer gas is used to cool the rovibrational states and a reflectron type time of flight mass spectrometer detects the ions. Action spectroscopy on the trapped and cooled ions can be performed perpendicular to the trap axis by means of narrow band infrared lasers and THz radiation. The latest status on vibrational spectroscopy of amino acids and water clusters will be presented.

[1] Spaun, B., et al., Nature, 533, 2016, 517.

[2] Boyarkin, O. V., et al., J. Am. Chem. Soc., 128, 2006, 2816.

[3] Kamrath, M. Z., et al., J. Am. Chem. Soc., 133, 2011, 6440.

[4] Günther, A., et al., J. Mol. Spec., 2016.