Berlin 2014 – scientific programme

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MO: Fachverband Molekülphysik

MO 13: Posters 3: Cold Molecules, Helium Nano Droplets, and Experimental Techniques

MO 13.4: Poster

Wednesday, March 19, 2014, 16:30–18:30, Spree-Palais

Development of a versatile ion trap based experimental station for the study of biomolecular ions — •Tim Michaelsen, Sunil Kumar, Thorsten Best, and Roland Wester — Institut f. Ionenphysik und Angewandte Physik, Universität Innsbruck

Intramolecular vibrational relaxation of biomolecules upon UV excitation is the key process determining their stability against radiation damage[1]. However, the details of the mechanism behind this process are still poorly understood.

We are currently developing a versatile ion trap based experimental station which will allow us to examine this process in detail. The biomolecular ions are produced in an electrospray ion source[2] with an ion-funnel interface[3], which has already been implemented and characterized. The ions are then guided by a linear quadrupole and mass selected by a second quadrupole. They will be stored and cooled down to 4K in a unique 16-pole ion trap, which is designed to allow for laser irradiation of ions normal to the trap axis similar to our wire-based octupole ion trap[4]. The ions extracted from the ion trap are then analyzed using a reflectron-based time-of-flight mass spectrometer. To investigate the details of the intermolecular vibrational relaxation of chromophore-based molecules, we will choose the fluorescent protein chromophore anion as a model system.

[1] A.V. Bochenkova , L.H. Andersen , Faraday Discuss.163, 297-319 (2013); [2] Gaskell, S. J. , J. Mass Spectrom. 32, 677-688. (1997); [3] Ryan T Kelly, et al., Mass Spectrom. Rev., 29, 294-312 (2010); [4] J. Deiglmayr, et al., Phys. Rev. A 86, 043438 (2012);