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@ARTICLE{Wilson:884824,
      author       = {Wilson, Daniel Julian Arthur and Schmitz, Christoph and
                      Rudolf, Denis and Wiemann, Carsten and Schneider, Claus M
                      and Juschkin, Larissa},
      title        = {{O}n space charge effects in laboratory-based photoemission
                      electron microscopy using compact gas discharge extreme
                      ultraviolet sources},
      journal      = {New journal of physics},
      volume       = {22},
      issn         = {1367-2630},
      address      = {[London]},
      publisher    = {IOP},
      reportid     = {FZJ-2020-03279},
      pages        = {103019},
      year         = {2020},
      abstract     = {The analysis of electronic and structural properties of
                      surfaces has been greatly advanced by photoemission electron
                      microscopy and spectroscopy techniques. To further improve
                      lateral and energy resolution of the instruments, it is
                      necessary to optimize parameters of the radiation sources
                      employed for photoemission studies (e.g. photon flux, pulse
                      duration, spot size etc.). We studied space charge effects
                      observed in an energy-filtering photoemission electron
                      microscope operated with a compact laboratory-scale
                      gas-discharge extreme ultraviolet light source. In this
                      system, we found limits of spatial- and energy-resolution
                      controlled by the source radiation parameters. The pulse
                      repetition rate can be varied in the kHz range and the
                      duration of the EUV emission was measured to be several tens
                      of nanoseconds long, and thereby very different from the
                      standard synchrotron sources typically used for similar
                      experiments. The spatial resolution could be improved by a
                      factor of 5, but only on the expense of the photon density
                      per pulse, which had to be decreased by a factor of 17 in
                      order to reduce the image blur due to space charge effects.
                      Furthermore, we found broadening of the X-ray photoelectron
                      spectroscopy peaks for high photon fluxes. We have also
                      performed a n-body Monte Carlo simulation to evaluate the
                      difference between core-level photoelectrons and secondary
                      electrons with respect to space charge.},
      cin          = {PGI-9 / PGI-6 / JARA-FIT},
      ddc          = {530},
      cid          = {I:(DE-Juel1)PGI-9-20110106 / I:(DE-Juel1)PGI-6-20110106 /
                      $I:(DE-82)080009_20140620$},
      pnm          = {521 - Controlling Electron Charge-Based Phenomena
                      (POF3-521)},
      pid          = {G:(DE-HGF)POF3-521},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000578365400001},
      doi          = {10.1088/1367-2630/abbc29},
      url          = {https://juser.fz-juelich.de/record/884824},
}