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Vacuum space charge effects in sub-picosecond soft X-ray photoemission on a molecular adsorbate layer

  • Vacuum space charge induced kinetic energy shifts of O 1s and Ru 3d core levels in femtosecond soft X-ray photoemission spectra (PES) have been studied at a free electron laser (FEL) for an oxygen layer on Ru(0001). We fully reproduced the measurements by simulating the in-vacuum expansion of the photoelectrons and demonstrate the space charge contribution of the high-order harmonics in the FEL beam. Employing the same analysis for 400 nm pump-X-ray probe PES, we can disentangle the delay dependent Ru 3d energy shifts into effects induced by space charge and by lattice heating from the femtosecond pump pulse. (C) 2015 Author(s).

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Author details:Martina Dell'Angela, Toyli Anniyev, Martin BeyeORCiDGND, Ryan Coffee, Alexander FöhlischORCiDGND, Jörgen Gladh, Sarp Kaya, Tetsuo Katayama, Oleg Krupin, Anders Nilsson, Dennis Nordlund, William F. Schlotter, Jonas A. Sellberg, Florian SorgenfreiORCiDGND, Joshua J. Turner, Henrik ÖstrÖm, Hirohito Ogasawara, Martin Wolf, Wilfried Wurth
DOI:https://doi.org/10.1063/1.4914892
ISSN:2329-7778
Title of parent work (English):Structural dynamics
Publisher:American Institute of Physics
Place of publishing:Melville
Publication type:Article
Language:English
Year of first publication:2015
Publication year:2015
Release date:2017/03/27
Volume:2
Issue:2
Number of pages:10
Funding institution:LCLS; Stanford University through the Stanford Institute for Materials Energy Sciences (SIMES); Lawrence Berkeley National Laboratory (LBNL); University of Hamburg through the BMBF priority program [FSP 301]; Center for Free Electron Laser Science (CFEL); BMBF priority program [FSP 301 FLASH]; VolkswagenStiftung
Organizational units:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie
Peer review:Referiert
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