Hannover 2020 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 6: Atomic clusters (joint session A/MO)
A 6.3: Vortrag
Montag, 9. März 2020, 15:00–15:15, a320
Setup and characterization of a helium liquid jet for diffraction experiments — •K. Kolatzki1,2, R. M. P. Tanyag2, G. Noffz2, A. Ulmer2, T. Möller2, and D. Rupp1,3 — 1LFKP, ETH Zurich, Switzerland — 2IOAP, TU Berlin — 3Max-Born-Institut Berlin
When conducting coherent diffractive imaging experiments at XUV and X-ray facilities with atomic clusters as targets, it is desirable that these targets are constant in size and spacing. Large helium droplets produced via Rayleigh-type breakup of a liquid jet meet these requirements: Compared to other types of clusters or droplets, they can exhibit very narrow size distributions and even spacing. Helium droplets also have a simple electronic structure, show interesting properties like superfluidity and can be used as a cooling matrix for embedded atoms and molecules.
Recently, we have constructed and characterized a source for a helium liquid jet and subsequent droplets, which is available for user experiments at the European XFEL's SQS endstation. Via shadowgraphy methods, we have analyzed the jet's shape and the droplet size distributions. Results from these measurements and an improved setup will be presented.