Erlangen 2018 – scientific programme
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A: Fachverband Atomphysik
A 16: Atomic Clusters I (joint session A/MO)
A 16.1: Talk
Monday, March 5, 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 Rudenko5 — 1University 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.