Erlangen 2018 – scientific programme
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A: Fachverband Atomphysik
A 22: Atomic Clusters II (joint session A/MO)
A 22.3: Talk
Tuesday, March 6, 2018, 14:30–14:45, K 2.016
Two-color diffraction imaging of helium nanodroplets — •L. Hecht1, B. Langbehn1, Y. Ovcharenko1,2, M. Sauppe1, J. Zimmermann1, B. Kruse3, C. Peltz3, K. Sander3, A. Colombo4, P. Piseri4, A. D’ Elia5, M. di Fraia6, L. Giannessi6, O. Plekan6, K. Prince6,7, M. Zangrando6, C. Callegari6, T. Möller1, T. Fennel3,8, and D. Rupp1,8 — 1IOAP, TU Berlin — 2XFEL@DESY — 3Univ. Rostock — 4Univ. Milano — 5Univ. Trieste — 6FERMI@Elettra — 7IOM, Trieste — 8MBI, Berlin
Extremely intense femtosecond pulses produced by short-wavelength free-electron lasers open up the possibility to image non-depositable nanostructures like superfluid helium nanodroplets in a single shot [Gomez et al. Science 345 (2014)] and to follow the transient formation [Bostedt et al. PRL 108 (2012)] and disintegration [Gorkhover et al. Nat. Phot. 10 (2016)] of laser-excited matter. At the FERMI facility a two-color XUV beam [Ferrari et al. Nat. Comm. 7 (2016)] can be used to perform time-resolved imaging with the goal to investigate ultrafast excitation and plasma dynamics.
Two diffraction images, each generated by one color, of the same He droplet can be separated through filter foils in front of the scattering detector. A pulsed cryogenic cluster source produces these at a size of several hundred nanometers. A combination of around 21 and 42 eV is scanned for a resonant scattering response, as the singly (1s2p) and doubly (2p3p) excited states of atomic He lie close to these energies, and thereby spatially resolve the excitation profile of the nanodroplets. The experimental setup and first results will be presented.