Heidelberg 2015 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 4: Ion Traps, Molecules, Clusters, Decay and Reactions
MS 4.7: Vortrag
Dienstag, 24. März 2015, 12:45–13:00, PH/HS2
Slow molecular beams of biochromophores via laser induced acoustic desorption — •Ugur Sezer1, Lisa Wörner1, Christoph Götz2, Alipasha Vaziri2, and Markus Arndt1 — 1University of Vienna, Faculty of Physics, VCQ and QuNaBioS, Boltzmanngasse 5, 1090 Vienna, Austria — 2University of Vienna, Max F. Perutz Laboratories; Research Institute of Molecular Pathology; QuNaBioS, Doktor-Bohr-Gasse 7, 1030 Vienna, Austria.
A beam of intact, neutral, and slow molecules is an essential criterion for experiments in physical chemistry and quantum optics, such as deflectometry and matter-wave interferometry[1]. Different molecular beam methods have been developed over recent years, among them thermal beams of functionalized molecules[2], free laser desorption[3] or supersonic expansion of laser desorbed molecules[4].
In this work we show that beams of intact, neutral, biologically relevant chromophores, such as chlorophyll a and hemin can be launched in high vacuum with mean velocities as low as 45 m/s with minimal fragmentation. The molecules are volatilized via laser-induced acoustic desorption[5], photoionized with lasers light at 157 nm or 266 nm, and detected in time-of-flight mass spectrometry. We present mass spectra, desorption and photoionization efficiencies as well as velocity distributions and discuss possible applications.
[1] K. Hornberger et al. Rev. Mod. Phys. 2012, 84. [2] S. Eibenberger et al. Phys. Chem. Chem. Phys. 2013, 15. [3] P. Schmid et al. J. Am. Soc. Mass. Spectrom. 2013, 24. [4] M.-H. Ha-Thi et al. Phys. Chem. Chem. Phys. 2010, 12. [5] A.V. Zinovev et al. Anal. Chem. 2007, 79.