Dresden 2020 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 28: Microscopy and Spectroscopy with X-rays, Ions and Positrons (joint session KFM/CPP)

CPP 28.1: Vortrag

Montag, 16. März 2020, 15:00–15:20, TOE 317

Single-Shot Phase-Contrast Microscopy of Laser-induced Cavitation at MID/EuXFEL — •Johannes Hagemann1, Malte Vassholz2, Hannes Höppe2, Markus Osterhoff2, Juan Rosello3, Robert Mettin3, Andreas Schropp1, Christian Schroer1, 4, and Tim Salditt21DESY, Notkestraße 85, 22607 Hamburg — 2Institut für Röntgenphysik, Friedrich-Hund-Platz 1, 37077 Göttingen — 3Drittes Physikalisches Institut, Friedrich-Hund-Platz 1, 37077 Göttingen — 4Department Physik, Universität Hamburg,Luruper Chaussee 149, 22761 Hamburg

X-ray free electron lasers offer unique opportunities for imaging of ultra-fast processes on smallest length-scales paired with the penetration power of hard X-rays. One of these processes is laser-induced cavitation in water. The dynamic nature of the processes under study is incompatible to scanning schemes for image acquisition thus we chose propagation-based near-field imaging as full-field imaging scheme. The illumination with high intensity, fs-short X-ray pulses enables imaging with single pulses which yield a still image of the cavitation bubble without motion blur. In this contribution we will present a pump-probe imaging experiment conducted at the MID instrument at the European XFEL. The experiment has been carried out at 14/17.8 keV photon energy. The X-rays have been focused by aberration corrected Be-compound refractive lenses down to 100 nm focus-size. The fluctuating nature of the SASE-process poses some challenges for the data analysis. We present our approach to the data-processing, phase-retrieval and results.

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