Mainz 2017 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 4: Spectroscopy of Cold Molecules and Complexes
MO 4.8: Vortrag
Montag, 6. März 2017, 18:45–19:00, N 25
Characterising and Optimising of a Novel Laser Desorption Source — •Nicole Teschmit1,2, Daniel Horke1,2, Karol Długołȩcki1, Daniel Gusa1, and Jochen Küpper1,2,3 — 1Center for Free- Electron Laser Science, DESY, Hamburg — 2The Hamburg Center for Ultrafast Imaging, University of Hamburg — 3Department of Physics, University of Hamburg
The control of small and moderate-size gas-phase molecules, such as the spatial separation of different quantum states, conformers, and molecular clusters, has been demonstrated, using static and/or dynamic electric fields [1]. Here, we present a new laser-desorption source for the production of very cold molecular beams, which will extend the above-mentioned techniques to larger biologically important molecules, such as peptides. The molecular beam of a laser-desorption source is for the first time characterized using strong field ionization by a femtosecond laser, combined with a time of flight mass spectrometer. Strong field ionization allows the detection of all existing species (including molecular fragments produced by the desorption process) and atoms in the interaction region. The beam can now be fully characterized and the conditions optimized for the production of intact sample molecules in the beam and the separation of one conformer from the beam can be shown. This makes this source suitable for use with non-species selective techniques, like time resolved single molecule diffractive imaging experiments.
[1] Y.-P. Chang, D. A. Horke, S. Trippel, J. Küpper, Int. Rev. Phys. Chem. 34, 557 (2015)