Mainz 2017 – scientific programme

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MO: Fachverband Molekülphysik

MO 19: Clusters II (with A)

MO 19.1: Invited Talk

Friday, March 10, 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. Fennel¹ — ¹Uni 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.