SAMOP 2021 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 5: Atomic clusters (together with MO)

A 5.3: Poster

Dienstag, 21. September 2021, 16:30–18:30, P

Time-resolved dynamics in xenon clusters induced by intense XUV pulses — •M Sauppe¹, T Bischoff², C Bomme³, C Bostedt⁴, B Erk⁵, T Feigl⁶, L Flueckiger⁷, T Gorkhover⁸, K Kolatzki¹, B Langbehn², D Rompotis⁹, B Senfftleben¹⁰, R Treusch⁵, A Ulmer², J Zimbalski², J Zimmermann¹, T Moeller², and D Rupp¹ — ¹ETH Zurich — ²TU Berlin — ³IRAMIS — ⁴PSI, EPFL — ⁵DESY — ⁶optiXfab — ⁷La Trobe University — ⁸Uni Hamburg — ⁹XFEL — ¹⁰MBI

Short-wavelength free-electron laser (FEL) enable the investigation of laser-matter-interaction at high photon energies with an unprecedented high spatial and temporal resolution. Rare gas clusters are an ideal testbed for such studies, e.g. due to their tunability in size and lag of paths for energy dissipation. Clusters exposed to tightly focused FEL pulses are quickly transformed into a non-equilibrium state. Photoionization and emission of kinetic electrons occurs within (sub-)femtoseconds, followed by the formation of a nanoplasma of ions and Coulomb-trapped electrons. Energy redistribution and expansion processes may last up to nanoseconds. Using two XUV pulses in a pump-probe scheme with a maximum time-delay of 650 ps, we were able to trace electron-ion recombination and the cluster expansion in a so far unexplored time-regime. As a result of the preceding expansion we found a reduced electron-ion-recombination for increasing time-delays. Further, the analysis of ion kinetic energies showed a plasma driven expansion for smaller clusters. For larger clusters, we found a growing importance of a coulomb explosion of the outer cluster shells.