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Erlangen 2018 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 6: Atomic Clusters I (joint session A/MO)

MO 6.1: Vortrag

Montag, 5. März 2018, 16:15–16:30, K 2.016

X-ray coherent diffractive imaging of quantum vortices in single helium droplets — •Rico Mayro Tanyag1, Charles Bernando1, Curtis Jones1, Luis Gomez1, Andrey Vilesov1, Camila Bacellar2, James Cryan2, Oliver Gessner2, Ken Ferguson3, Sebastian Schorb3, Christoph Bostedt3,4, Daniel Rolles5, and Artem Rudenko51University of Southern California, Los Angeles, California USA — 2Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California USA — 3SLAC National Accelerator Laboratory, Menlo Park, California USA — 4Argonne National Laboratory, Lemont, Illinois USA — 5Kansas State University, Manhattan, Kansas USA

Free, single, rotating superfluid 4He nanodroplets (diameter D = 200-2000 nm, temperature T = 0.4 K) containing a number of quantum vortices have been studied via ultrafast X-ray coherent diffraction imaging using a free electron laser. The droplets were doped with Xe atoms, which collect on the vortex cores and serve as a contrast agent. In order to obtain the instantaneous positions and shapes of the vortices from the diffraction images, a phase retrieval algorithm has been developed, which utilizes the droplet boundary as a physical support. The algorithm also uses the droplet's scattering phase as an input for the iterative phase reconstruction. The obtained reconstructions reveal a plethora of transient vortex configurations within the droplet. The details of the algorithm and the possible origin of the observed vortex configuration will be discussed.

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