Nanomatrixeffekte in der ultraschnellen Ionisationsdynamik von Clustern in superfluiden Heliumtropfen
Zusammenfassung der Projektergebnisse
Rare gas clusters and helium droplets as well core-shell systems in strong laser fields have been studied experimentally. In addition to pump-probe spectroscopy, the so-called phase-of-the-phase (PoP) approach was used and further developed. In PoP spectroscopy, the momentum-resolved photoelectron yields are analyzed as function of the relative phase between the two color-components of the laser field, in order to provide high resolution spectra in a concise manner. The method was successfully applied to rare gas clusters embedded in ultracold helium nanodroplets and evidence was found that surface back scattering and plasmon-assisted forward scattering are the dominating acceleration mechanisms which lead to the directed emission of fast electrons. The second focus was set to the final disintegration of the nanoplasma on the ps up the ns timescale. Subsequent electron recombination gives rise to transitions between He+ states, resulting in autoionization. The time-resolved analysis of the energy transfer to quasifree electrons reveals a transient depletion of the Auger emission, which allows for a temporal gate to map the distribution of delocalized electrons in the developing mean field. Furthermore, the recombination of delocalized electrons near the vacuum level into highly excited Rydberg states was traced by monitoring the highly charged ion as well as the electron observable. Transient above-threshold ionization has been introduced as a diagnostic tool to resolve the electron dynamics whose sensitivity was enhanced by applying two-color phase-of-the-phase spectroscopy.
Projektbezogene Publikationen (Auswahl)
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Comparison of Electron and Ion Emission from Xenon Cluster-Induced Ignition of Helium Nanodroplets. J. Phys. Chem. A 122, 8107–8113 (2018)
M. Kelbg, A. Heidenreich, L. Kazak, M. Zabel, B. Krebs, K.-H. Meiwes-Broer, J. Tiggesbäumker
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Highly charged Rydberg ions from the Coulomb explosion of clusters. Phys. Rev. Lett. 120, 133207 (2018)
D. Komar, L. Kazak, M. Almassarani, K-H. Meiwes-Broer, and J. Tiggesbäumker
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Optical probing of high intensity laser interaction with micron-sized cryogenic hydrogen jets, Plasma Phys. Control. Fusion 60, 074003 (2018)
T. Ziegler, M. Rehwald, L. Obst, C. Bernert, F.-E. Brack, C. Breanne Curry, M. Gauthier, S. H. Glenzer, S. Göde, L. Kazak, S. Kraft, M. Kuntzsch, M. Loeser, J. Metzkes-Ng, C. Roedel, H.-P. Schlenvoigt, U. Schramm, M. Siebold, J. Tiggesbäumker, S. Wolter, and K. Zeil
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All-optical spatio-temporal control of electron emission from SiO2 nanospheres with femtosecond two-color laser fields. New J. Phys. 21, 073011 (2019)
Q. Liu, S. Zherebtsov, L. Seiffert, S. Skruszwwicz, D. Zietlow, S. Ahn, P. Rupp, P. Wnuk, S. Sun, A. Kassel, S. Trushin, A. Schlander, D. im, E. Rühl, M. F. Ciappina, J. Tiggesbäumker, M. Gallei, T. Fennel, M. F Kling
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Auger Emission from the Coulomb Explosion of Helium Nanoplasmas. J. Chem. Phys. 150, 204302 (2019)
M. Kelbg, M. Zabel, B. Krebs, L. Kazak, K.-H. Meiwes-Broer, J. Tiggesbäumker
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Ionization-Induced Subcycle Metallization of Nanoparticles in Few-Cycle Pulses. ACS Photonics 7,3207-3215 (2020)
Q. Liu, L. Seiffert, F. Sußmann, S. Zherebtsov, J. Passig, A. Kessel, S. A. Trushin, N. G. Kling, I. Ben-Itzhak, V. Mondes, C. Graf, E. Ruhl, L. Veisz, S. Karsch, J. Rodrıg uez-Fernan dez, M. I. Stockman, J. Tiggesbäumker, K.-H. Meiwes-Broer, T. Fennel, M. F. Kling
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Temporal development of a laser-induced helium nanoplasma measured through Auger emission and above-threshold ionization. Phys. Rev. Lett. 125, 093202 (2020)
M. Kelbg, M. Zabel, B. Krebs, L. Kazak, K.-H. Meiwes-Broer, J. Tiggesbäumker
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Development of ion recoil energy distributions in the Coulomb explosion of argon clusters resolved by charge-state selective ion energy spectroscopy. Eur. Phys. J. Special Topics 230, 3989-3995 (2021)
D. Komar, L. Kazak, K.-H. Meiwes-Broer, J. Tiggesbäumker
