Mainz 2017 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 4: Spectroscopy of Cold Molecules and Complexes

MO 4.5: Vortrag

Montag, 6. März 2017, 18:00–18:15, N 25

Optical photodissociation spectroscopy of metal lumichrome ionic complexes using the 22-Pole BerlinTrap — •David Müller, Pablo Nieto, Alan Günther, Alex Sheldrick, and Otto Dopfer — Institut für Optik und Atomare Physik, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin

Flavin-containing systems act as light sensors in plants and as blue-light receptors in fungals due to their wide spectral absortion from the VIS to the UV. They differ in their substituents at the N10 position. The simplest flavin without any substituent is lumichrome (LC). Most experiments concerning flavins were performed in solution, but not on isolated gas phase ions. Hence, the influence of the solvent and the ions is not fully understood yet. We report first vibronic spectra of protonated lumichrome H⁺LC [1] and metalated lumichrome (M⁺LC, M = Li-Cs). The gas-phase ions are generated in an ESI-source, mass-selected by a QPMS and cooled in a cryogenic 22-pole trap. After laser irradtion (380-500 nm) the fragments are mass-selected by an orthogonal ReTOF mass spectrometer. This design enables us to detect all fragments and the parent ion simultaneously. By comparison to quantum chemical calculations, we can assign the N5 position as the protonation site and the O4 position as the metalation site.

[1] A. Günther et al., J. Mol. Spectrosc. (2016), in press DOI:10.1016/j.jms.2016.08.017