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Title: Covariance mapping of two-photon double core hole states in C 2 H 2 and C 2 H 6 produced by an x-ray free electron laser

Few-photon ionization and relaxation processes in acetylene (C2H2) and ethane (C2H6) were investigated at the linac coherent light source x-ray free electron laser (FEL) at SLAC, Stanford using a highly efficient multi-particle correlation spectroscopy technique based on a magnetic bottle. The analysis method of covariance mapping has been applied and enhanced, allowing us to identify electron pairs associated with double core hole (DCH) production and competing multiple ionization processes including Auger decay sequences. The experimental technique and the analysis procedure are discussed in the light of earlier investigations of DCH studies carried out at the same FEL and at third generation synchrotron radiation sources. In particular, we demonstrate the capability of the covariance mapping technique to disentangle the formation of molecular DCH states which is barely feasible with conventional electron spectroscopy methods.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [7] ;  [7] ;  [7] ;  [7] ;  [8] ;  [9] ;  [10] ;  [10] ;  [10] ;  [11] ;  [12] ;  [13] ;  [14] more »;  [15] ;  [16] ;  [15] ;  [17] ;  [15] ;  [15] ;  [15] ;  [18] ;  [19] ;  [20] ;  [21] ;  [21] ;  [22] « less
  1. Uppsala Univ. (Sweden). Dept. of Physics and Astronomy.
  2. Uppsala Univ. (Sweden). Dept. of Physics and Astronomy; Univ. of Gothenburg (Sweden). Dept. of Physics; Stockholm Uinv. (Sweden). AlbaNova University Center, Dept. of Physics
  3. Imperial College, London (United Kingdom). Department of Chemistry.
  4. Uppsala Univ. (Sweden). Dept. of Physics and Astronomy; Univ. of Gothenburg (Sweden); Imperial College, London (United Kingdom). Dept. of Physics
  5. Imperial College, London (United Kingdom). Dept. of Physics
  6. Uppsala Univ. (Sweden). Dept. of Physics and Astronomy; Oxford University, (United Kingdom). Dept. of Chemistry
  7. Stockholm Univ. (Sweden). Dept. of Physics, Albanova University Center.
  8. Advanced Study Group of the Max Planck Society, Hamburg (Germany); Max Planck Institute fur medizinische Forschung, Heidelberg (Germany).
  9. Max Planck-Institute fur Kernphysik, Heidelberg (Germany); Physikalisch-Technische Braunschweig (Germany)
  10. Tohoku Univ., Sendai (Japan). Institute for Interdisciplinary Material Research
  11. Western Michigan Univ., Kalamazoo MI (United States). Dept. of Physics
  12. Western Michigan Univ., Kalamazoo MI (United States). Dept. of Physics; Univ. of Texas, Arlington, TX (United States). Center for High Energy Density Science
  13. Western Michigan Univ., Kalamazoo MI (United States). Dept. of Physics
  14. Western Michigan Univ., Kalamazoo MI (United States). Dept. of Physics; Univ. of Connecticut, Storrs, CT (United States). Dept of Physics
  15. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  16. SLAC National Accelerator Lab., Menlo Park, CA (United States); SOLEIL, Gif-sur-Yvette (France)
  17. SLAC National Accelerator Lab., Menlo Park, CA (United States); NSF BioXFEL Science and Technology Center, Buffalo, NY (United States)
  18. Hiroshima Univ. (Japan). Institute for Sustainable Science and Development.
  19. Hiroshima Univ. (Japan). Dept. of Physical Science.
  20. Univ. of Paris (France). Laboratoire de Chimie Physique, Matière et Rayonnement (LCPMR) and CNRS
  21. Elettra-Sincrotrone Trieste, Basovizza (Italy)
  22. Uppsala Univ. (Sweden). Dept. of Physics and Astronomy; Univ. of Gothenburg (Sweden). Dept. of Physics
Publication Date:
OSTI Identifier:
1211615
Grant/Contract Number:
EP/F032517/1; EP/F034601/1; FIRB-RBAP045JF2; FIRB-RBAP06AWK3; AC03-76SF00515
Type:
Accepted Manuscript
Journal Name:
New Journal of Physics
Additional Journal Information:
Journal Volume: 17; Journal Issue: 7; Journal ID: ISSN 1367-2630
Publisher:
IOP Publishing
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 double core hole, free electron laser, few-photon process, covariance mapping