Berlin 2014 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 5: Molecules, Clusters, Decay and Reactions
MS 5.2: Vortrag
Dienstag, 18. März 2014, 17:00–17:15, DO24 1.205
Desorption and evaporation sources with photoionizable organic molecules beyond 24 kDa for their suitability for matter wave interferometers — •Ugur Sezer1, Lukas Felix2, Philipp Schmid1, Marcel Mayor2,3, and Markus Arndt1 — 1University of Vienna, Faculty of Physics, QuNaBioS, VCQ Vienna, Austria — 2Department of Chemistry, University of Basel, Basel, Switzerland — 3Karlsruhe Institute of Technology (KIT), Institute of Nanotechnology, Karlsruhe, Germany
With new matter-wave interferometers substantial progress has been made in testing the quantum superposition in a domain of higher complexity. In order to push the limits of matter wave interferometry towards even higher masses, the production of a neutral and slow molecular beam of complex and massive molecules is essential. In this work we present a series of experiments characterizing different laser desorption sources in combination with photoionization (157 and 266 nm). A major result of these studies is the intact volatilization and successful single-photon ionization of organic molecules beyond 24 kDa. Using organic molecules between 7 and 13 kDa we investigate the mass dependence of the photoionization efficiency and of the desorption process. We present mass spectra, velocity distributions, photoionization efficiencies and fragmentation rates of large tailor-made perfluoroalkyl-functionalized molecules as well as more thermolabile biomolecules and we discuss the suitability of each of the desorption/evaporation sources for matter wave interferometry.