Rostock 2019 – scientific programme

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A: Fachverband Atomphysik

A 30: Atomic Physics, Molecular Physics, and Quantum Optics with X-ray FELs (joint session MO/A)

A 30.2: Talk

Thursday, March 14, 2019, 10:45–11:00, S HS 002 Biologie

3D sensitive diffractive imaging of metal cluster shape transitions — •J. Jordan¹, S. Dold², I. Barke³, P. Behrens¹, N. Bernhardt¹, J. Correa⁴, S. Düsterer⁴, B. Erk⁴, L. Hecht¹, A. Heilrath¹, H. Hartmann³, R. Irsig³, N. Iwe³, B. Kruse³, B. Langbehn¹, B. Manschwetus⁴, F. Martinez³, K. Oldenburg³, C. Passow⁴, C. Peltz³, F. Seel¹, R. Tanyag⁵, R. Treusch⁴, A. Ulmer¹, S. Walz¹, K.-H. Meiwes-Broer³, T. Fennel^3,5, B. v. Issendorff², T. Möller¹, and D. Rupp^1,5 — ¹TU Berlin — ²Univ. Freiburg — ³Univ.Rostock — ⁴FLASH@DESY — ⁵MBI Berlin

With their ability to deliver ultra-short X-ray pulses of high brilliance, free-electron lasers (FELs) have opened up new possibilities for natural sciences. In cluster physics, FELs have been used to investigate fundamental light-matter interactions and create scattering images of single clusters in free flight for structure determination. In particular, gas phase metal clusters exhibit a large variety of shapes that are very sensitive to the growth conditions. Their shape can be altered by soft heating, leading to a reordering of the crystal lattice or melting of the surface. In order to image these changes and record their intrinsic timescale, we performed a pump-probe experiment at the FLASH FEL in Hamburg. Silver clusters were produced using a magnetron sputter source and subsequently heated with a picosecond-long, weak optical laser pulse. The temporal evolution of the shapes after excitation was traced by recording wide-angle scattering images that enable a 3D sensitive shape retrieval.