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Title: Sensitivity of nonlinear photoionization to resonance substructure in collective excitation

Collective behaviour is a characteristic feature in many-body systems, important for developments in fields such as magnetism, superconductivity, photonics and electronics. Recently, there has been increasing interest in the optically nonlinear response of collective excitations. Here we demonstrate how the nonlinear interaction of a many-body system with intense XUV radiation can be used as an effective probe for characterizing otherwise unresolved features of its collective response. Resonant photoionization of atomic xenon was chosen as a case study. The excellent agreement between experiment and theory strongly supports the prediction that two distinct poles underlie the giant dipole resonance. Our results pave the way towards a deeper understanding of collective behaviour in atoms, molecules and solid-state systems using nonlinear spectroscopic techniques enabled by modern short-wavelength light sources.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [4] ;  [5] ;  [6] ;  [6] ;  [6] ;  [1] ;  [2]
  1. European XFEL GmbH, Hamburg (Germany)
  2. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany); Univ. of Hamburg, Hamburg (Germany)
  3. European XFEL GmbH, Hamburg (Germany); SLAC National Accelerator Lab., Menlo Park, CA (United States)
  4. European XFEL GmbH, Hamburg (Germany); Univ. of Hamburg, Hamburg (Germany)
  5. CNR Instituto di Struttura della Materia, Monterotondo Scalo (Italy)
  6. Dublin City Univ., Dublin (Ireland)
Publication Date:
OSTI Identifier:
1208911
Grant/Contract Number:
AC03-76SF00515
Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 6; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Research Org:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS physical sciences; atomic and molecular physics