Mainz 2017 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 35: Clusters II (with MO)

A 35.3: Vortrag

Freitag, 10. März 2017, 11:45–12:00, N 3

The 3D shapes of spinning helium nanodroplets — •B. Langbehn¹, Y. Ovcharenko^1,2, D. Rupp¹, K. Sander³, C. Peltz³, A. Clark⁴, R. Cucini⁵, P. Finetti⁵, M. Di Fraia⁵, D. Iablonskyi⁶, A. C. LaForge⁷, V. Oliver Álvarez de Lara⁴, O. Plekan⁵, P. Piseri⁸, T. Nishiyama⁹, C. Callegari⁵, K. C. Prince⁵, K. Ueda⁶, F. Stienkemeier⁷, T. Fennel³, and T. Möller¹ — ¹TU Berlin — ²European XFEL — ³Univ. Rostock — ⁴EPFL, Lausanne — ⁵Elettra-Sincrotrone Trieste — ⁶Tohoku Univ. Sendai — ⁷Univ. Freiburg — ⁸Univ. di Milano — ⁹Kyoto Univ.

Scattering techniques using intense femtosecond short-wavelength pulses from free-electron lasers (FEL) have been developed to gain an insight into the structure of nanoparticles such as viruses or clusters. Recent pioneering experiments in the hard X-ray range revealed that superfluid helium nanodroplets can gain high angular momentum resulting in large centrifugal deformation [1]. While hard X-ray experiments push towards atomic resolution, full 3D information on the particle shape (and orientation) from a single scattering pattern requires access to the wide-angle scattering signal available only at longer wavelength [2]. We have used intense XUV pulses from the FERMI-FEL to retrieve the 3D shapes of single helium nanodroplets. We follow the evolution from axisymmetric oblate over triaxial prolate to two-lobed droplets with increasing angular momentum, as predicted by the theoretical model of a classical spinning drop.

[1] Gomez et al., Science 345 (2014)

[2] Barke et al., Nat. Comm. 6 (2015)