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Mainz 2017 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 19: Clusters II (with A)

MO 19.1: Hauptvortrag

Freitag, 10. März 2017, 11:00–11:30, N 3

The Nanoplasma Oscilloscope — •Christian Peltz1, A. LaForge2, B. Langbehn3, R. Michiels2, C. Callegari4, M. Di Fraia4, P. Finetti4, R. Squibb5, C. Svetina4, L. Raimondi4, M. Manfredda4, N. Mahne4, P. Piseri6, M. Zangrando4, L. Giannessi4, T. Möller3, R. Feifel5, K. C. Prince4, M. Mudrich2, D. Rupp3, F. Stienkemeier2, and T. Fennel11Uni Rostock, Germany — 2Uni Freiburg, Germany — 3TU Berlin, Germany — 4ELETTRA-Sincrotrone Trieste, Italy — 5Uni Gothenburg, Sweden — 6Uni Milan, Italy

Atomic clusters enable the well-controlled generation of nanoscale plasmas allowing for the study of their ultrafast light-induced correlated and collective dynamics. In particular, short-wavelength FELs can probe these dynamics in a regime that is fundamentally different from the well-known near-infrared domain. Plasma processes like collisional plasma heating, collective resonance excitation, and ionization avalanching that are generic in the NIR are strongly suppressed in the XUV and soft X-ray domain. Instead, sequential direct photo- or Auger emission dominates the plasma generation and heating dynamics. Signatures of this multistep ionization are characteristic plateau-like electron spectra and frustration of direct photo-emission by the cluster potential. Here we report the first direct time-resolved measurement of the underlying cluster potential evolution using the nanoplasma oscilloscope method, implemented in a recent two-color XUV pump-probe experiment at the seeded, high gain harmonic generation FEL FERMI FEL-2 operating in double stage mode.

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