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Marcel Mudrich

Novel collective autoionization process observed in electron spectra of He clusters

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  • Y. Ovcharenko, Technical University of Berlin
  • ,
  • Victor Lyamayev, Albert-Ludwigs-Universität Freiburg
  • ,
  • R. Katzy, Albert-Ludwigs-Universität Freiburg
  • ,
  • M. Devetta, Universita degli Studi di Milano
  • ,
  • A. C. LaForge, Albert-Ludwigs-Universität Freiburg
  • ,
  • P. O'Keeffe, Consiglio Nazionale delle Ricerche
  • ,
  • O. Plekan, Elettra-Sincrotrone Trieste S.C.p.A.
  • ,
  • P. Finetti, Elettra-Sincrotrone Trieste S.C.p.A.
  • ,
  • M. Di Fraia, Elettra-Sincrotrone Trieste S.C.p.A., Universita degli Studi di Trieste
  • ,
  • M. Mudrich
  • M. Krikunova, Technical University of Berlin
  • ,
  • P. Piseri, Universita degli Studi di Milano
  • ,
  • M. Coreno, Consiglio Nazionale delle Ricerche, Elettra-Sincrotrone Trieste S.C.p.A.
  • ,
  • N. B. Brauer, École Polytechnique Fédérale de Lausanne
  • ,
  • T. Mazza, European XFEL GmbH
  • ,
  • S. Stranges, Sapienza University of Rome, Area Science Park
  • ,
  • Cesare Grazioli, Elettra-Sincrotrone Trieste S.C.p.A., Area Science Park, Universita degli Studi di Trieste
  • ,
  • R. Richter, Elettra-Sincrotrone Trieste S.C.p.A.
  • ,
  • Kevin C Prince, Elettra-Sincrotrone Trieste S.C.p.A., Area Science Park
  • ,
  • M. Drabbels, École Polytechnique Fédérale de Lausanne
  • ,
  • C. Callegari, Elettra-Sincrotrone Trieste S.C.p.A.
  • ,
  • F. Stienkemeier, Albert-Ludwigs-Universität Freiburg
  • ,
  • T. Möller, Institut für Optik und Atomare Physik, Technical University of Berlin

The ionization dynamics of He nanodroplets irradiated with intense femtosecond extreme ultraviolet pulses of up to 1013 W/cm2 power density have been investigated by photoelectron spectroscopy. Helium droplets were resonantly excited to atomiclike 2p states with a photon energy of 21.4 eV, below the ionization potential (Ip), and directly into the ionization continuum with 42.8 eV photons. While electron emission following direct ionization above Ip is well explained within a model based on a sequence of direct electron emission events, the resonant excitation provides evidence of a new, collective ionization mechanism involving many excited atomiclike 2p states. With increasing power density the direct photoline due to an interatomic Coulombic decay disappears. It indicates that ionization occurs due to energy exchange between at least three excited atoms proceeding on a femtosecond time scale. In agreement with recent theoretical work the novel ionization process is very efficient and it is expected to be important for many other systems.

OriginalsprogEngelsk
Artikelnummer073401
TidsskriftPhysical Review Letters
Vol/bind112
Nummer7
ISSN0031-9007
DOI
StatusUdgivet - 20 feb. 2014
Eksternt udgivetJa

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