Autoionization dynamics of He nanodroplets resonantly excited by intense XUV laser pulses

Research output: Working paperResearch

  • Y. Ovcharenko
  • ,
  • A. LaForge
  • ,
  • B. Langbehn
  • ,
  • O. Plekan
  • ,
  • R. Cucini
  • ,
  • P. Finetti
  • ,
  • P. O'Keeffe
  • ,
  • D. Iablonskyi
  • ,
  • T. Nishiyama
  • ,
  • K. Ueda
  • ,
  • P. Piseri
  • ,
  • M. DiFraia
  • ,
  • R. Richter
  • ,
  • M. Coreno
  • ,
  • C. Callegari
  • ,
  • K. C. Prince
  • ,
  • F. Stienkemeier
  • ,
  • T. Moller
  • ,
  • M. Mudrich
The ionization dynamics of helium droplets in a wide size range from 220 to 10^6 He atoms irradiated with intense femtosecond extreme ultraviolet (XUV) pulses of 10^9 {\div} 10^{12} W/cm2 power density is investigated in detail by photoelectron spectroscopy. Helium droplets are resonantly excited in the photon energy range from ~ 21 eV (corresponding to the atomic 1s2s state) up to the atomic ionization potential (IP) at ~ 25 eV. A complex evolution of the electron spectra as a function of droplet size and XUV intensity is observed, ranging from atomic-like narrow peaks due to binary autoionization, to an unstructured feature characteristic of electron emission from a nanoplasma. The experimental results are analyzed and interpreted with the help of numerical simulations based on rate equations taking into account various processes such as multi-step ionization, interatomic Coulombic decay (ICD), secondary inelastic collisions, desorption of electronically excited atoms, collective autoionization (CAI) and further relaxation processes.
Original languageEnglish
PublisherArXiv
Publication statusPublished - 14 Feb 2019

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