Mainz 2017 – scientific programme
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MO: Fachverband Molekülphysik
MO 18: Biomolecules and Electron Transfer
MO 18.6: Talk
Friday, March 10, 2017, 12:15–12:30, N 25
Laser-induced acoustic desorption of large molecules for FEL experiments — •Zhipeng Huang1,2, Daniel A. Horke1,3, Matthias Schust1, Tim Ossenbrüggen1, and Jochen Küpper1,2,3 — 1Center for Free-Electron Laser Science, DESY, Hamburg — 2Department of Physics, University of Hamburg — 3Center for Ultrafast Imaging, University of Hamburg
Laser-induced acoustic desorption (LIAD) is a promising technique for gentle and efficient preparation of large intact neutral molecules into the gas-phase [1]. Here we demonstrate our newly set-up LIAD source, designed for prolonged measurement time, as required by FEL experiments, through automatic sample replenishment. Using a gas dynamic virtual nozzle we deposit a near-uniform layer of sample on a ∼1 m long, 10 µm thick tantalum foil band. An acoustic wave was initiated by irradiating the backside of the foil with the third harmonic of a nanosecond Nd:YAG laser. The induced photoacoustic shock wave travels through the foil and desorbs samples into the gas-phase. A stable neutral phenylalanine plume was prepared and characterized using strong-field ionization by an intense femtosecond laser field with a linear time of flight mass spectrometer. Spatial-temporal profiles, velocity distributions of the LIAD plume as a function of desorption laser intensity were investigated. Its potential for applications in x-ray or electron diffraction imaging will be discussed.
[1] B. Linder and U. Seydel, Anal. Chem. 57, 895 (1985)