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Search: WFRF:(Lahl Jan) > (2016)

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1.
  • Schütte, Bernd, et al. (author)
  • Autoionization following nanoplasma formation in atomic and molecular clusters
  • 2016
  • In: European Physical Journal D. Atomic, Molecular, Optical and Plasma Physics. - : Springer Science and Business Media LLC. - 1434-6060. ; 70:5
  • Journal article (peer-reviewed)abstract
    • Abstract: Nanoplasmas resulting from the ionization of nano-scale particles by intense laser pulses are typically described by quasiclassical models, where electron emission is understood to take place via thermal processes. Recently, we discovered that, following the interaction of intense near-infrared (NIR) laser pulses with molecular oxygen clusters, electron emission from nanoplasmas can also occur from atomic bound states via autoionization [Schütte et al., Phys. Rev. Lett. 114, 123002 (2015)]. Here we extend these studies and demonstrate that the formation and decay of doubly-excited atoms and ions is a very common phenomenon in nanoplasmas. We report on the observation of autoionization involving spin-orbit excited states in molecular oxygen and carbon dioxide clusters as well as in atomic krypton and xenon clusters ionized by intense NIR pulses, for which we find clear bound-state signatures in the electron kinetic energy spectra. By applying terahertz (THz) streaking, we show that the observed autoionization processes take place on a picosecond to nanosecond timescale after the interaction of the NIR laser pulse with the clusters. Graphical abstract: [Figure not available: see fulltext.]
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2.
  • Schütte, Bernd, et al. (author)
  • Slow electrons from intense laser-cluster interactions
  • 2016
  • In: International Conference on Ultrafast Phenomena, UP 2016. - 9781943580187
  • Conference paper (peer-reviewed)abstract
    • A surprisingly dominant contribution of slow electrons is observed following NIR strong-field ionization of clusters. This is consistent with highly efficient intra-Rydberg correlated electronic decay processes, from which the emission of low-energy electrons is expected.
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