Erlangen 2018 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
A: Fachverband Atomphysik
A 25: Poster Session I
A 25.29: Poster
Dienstag, 6. März 2018, 16:15–18:15, Redoutensaal
Modular He nanodroplet source for the SQS end station at the European XFEL — •Fabian Seel1, Anatoli Ulmer1, Bruno Langbehn1, Daniela Rupp1, Yevheniy Ovcharenko2, and Thomas Möller1 — 1IOAP, Technische Universität Berlin, Germany — 2European XFEL, Hamburg, Germany
Because of their unique properties, ultra-cold superfluid helium nanodroplets are considered to be perfect matrices for high resolution spectroscopy [Angew. Chem. Int. Ed. 2004, 43, 2622 - 2648] and can be doped with virtually any atomic or molecular sample. Diffraction patterns of such single free nanoparticles can be recorded using the ultra-short and bright X-ray pulses generated by X-Ray Free-Electron Lasers (XFEL). From those diffraction patterns, the structure of an embedded sample can be reconstructed quickly and reliably with the novel technique of Droplet Coherent Diffractive Imaging (DCDI) [Struct. Dyn. 2, 051102 (2015)]. To exploit valuable beamtime at the new European XFEL, we set up a new source for helium droplets, matching the XFEL’s pulse structure with a pulse train length of 600 µ s at a repetition rate of 10 Hz. At operating temperatures as low as 5 K, large droplets with N ≥ 108 atoms can be produced in an expansion through a conical nozzle. To provide a source for different conditions, we have developed a modular source head that is able to operate with either a pulsed Even-Lavie Valve or a commercial Parker Series 99 Pulsed Valve. First characterization measurements taken in the laboratory will be presented and discussed.