Berlin 2014 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 13: Posters 3: Cold Molecules, Helium Nano Droplets, and Experimental Techniques
MO 13.27: Poster
Mittwoch, 19. März 2014, 16:30–18:30, Spree-Palais
Laser-induced acoustic desorption setup for the soft vaporization of large molecules — Wilhelm F. Frisch1,3, •Zhipeng Huang1,3, Daniel A. Horke1, 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
Laser-induced acoustic desorption (LIAD) is a promising technique for the preparation of dense plumes of intact neutral large molecules. Coupled with ionization and spectroscopic characterization techniques, it is shown to be of great utility for the analysis of a variety of thermally labile analytes.
We present our newly set up laser-induced acoustic desorption (LIAD) source, which is coupled to a time-of-flight (TOF) mass spectrometer (MS). In the LIAD experiment the molecules are deposited onto a thin (∼10 µm) metal foil that is irradiated from the backside by the third harmonic of a Nd:YAG laser (355 nm). The induced shockwave travels through the foil and desorbs the molecules from the frontside of the foil [1]. The gas-phase molecules are subsequently strong-field ionized by a 40 fs Ti:Sapphire laser (800 nm) and mass-selectively detected in a TOF-MS. We discuss the efficiency of the source as well as the detailed characteristics of the created gas-phase sample as a function of experimental parameters, such as laser pulse energy and duration or foil parameters.
[1] B. Linder et al., Anal. Chem. 57, 895 (1985)