Hannover 2016 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 17: Electronic Spectroscopy 2
MO 17.6: Vortrag
Donnerstag, 3. März 2016, 15:45–16:00, f102
Laser-induced acoustic desorption of large molecules via tape-drive method — •Zhipeng Huang1,3, Daniel A. Horke1,2, Matthias Schust1, Tim Ossenbrüggen1, and Jochen Küpper1,2,3 — 1Center for Free-Electron Laser Science, DESY, Hamburg — 2Center for Ultrafast Imaging, University of Hamburg — 3Department of Physics, University of Hamburg
By dispersing molecular beams with strong electric fields, we can routinely produce pure samples of individual conformers or clusters according to their quantum state. Selected molecules can be further controlled using alignment and orientation by laser and static electric fields [1]. We are currently working towards extending these techniques to much large molecules and systems.
Laser-induced acoustic desorption (LIAD) is a promising technique for gentle and efficient preparation of large intact neutral molecules in the gas-phase [2]. Here we demonstrate our newly set-up LIAD source, designed for prolonged measurement times through automatic sample replenishment. Molecules are sprayed onto a long 10 µ m tantalum foil band that is irradiated from the backside by a third harmonic Nd:YAG laser (355 nm). The induced shockwave travels through the foil and desorbs molecules from the frontside of the foil. We present results and characterizations of the source, and discuss its potential for applications in x-ray or electron diffraction imaging.
[1] Y.P. Chang, D. A. Horke, S. Trippel and J. Küpper, Int. Rev. Phys Chem. 34, 557 (2015)
[2] B. Linder and U. Seydel, Anal. Chem. 57, 895 (1985)