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@ARTICLE{Marquardt:836858,
      author       = {Marquardt, Christian and Paulheim, Alexander and Rohbohm,
                      Nils and Merkel, Rudolf and Sokolowski, Moritz},
      title        = {{A} surface science compatible epifluorescence microscope
                      for inspection of samples under ultra high vacuum and
                      cryogenic conditions},
      journal      = {Review of scientific instruments},
      volume       = {88},
      number       = {8},
      issn         = {1089-7623},
      address      = {[S.l.]},
      publisher    = {American Institute of Physics},
      reportid     = {FZJ-2017-05894},
      pages        = {083702 -},
      year         = {2017},
      abstract     = {We modified an epi-illumination light microscope and
                      mounted it on an ultra high vacuum chamber for investigating
                      samples used in a surface science experiment. For easy
                      access and bake out, all optical components are placed
                      outside the vacuum and the sample is imaged through a glass
                      window. The microscope can be operated in reflection
                      brightfield or epifluorescence mode to image the sample
                      surface or fluorescent dye molecules adsorbed on it. The
                      homemade sample mounting was made compatible for the use
                      under the microscope; sample temperatures as low as 6 K can
                      be achieved. The performance of the microscope is
                      demonstrated on two model samples: Brightfield-images of a
                      well-prepared Ag(100) surface show a macroscopic corrugation
                      of the surface, although low energy electron diffraction
                      data indicate a highly ordered crystalline surface. The
                      surface shows macroscopic protrusions with flat regions,
                      about 20–200 μm in diameter, in between. Fluorescence
                      images of diluted 3,4,9,10-perylene tetracarboxylicacid
                      dianhydride (PTCDA) molecules adsorbed on an ultrathin
                      epitaxial KCl film on the Ag(100) surface show a shading
                      effect at surface protrusions due to an inclined angle of
                      incidence of the PTCDA beam during deposition. For some
                      preparations, the distribution of the fluorescence intensity
                      is inhomogeneous and shows a dense network of bright patches
                      about 5 μm in diameter related to the macroscopic
                      corrugation of the surface. We propose that such a light
                      microscope can aid many surface science experiments,
                      especially those dealing with epitaxial growth or
                      fluorescent materials},
      cin          = {ICS-7},
      ddc          = {530},
      cid          = {I:(DE-Juel1)ICS-7-20110106},
      pnm          = {552 - Engineering Cell Function (POF3-552)},
      pid          = {G:(DE-HGF)POF3-552},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000409178100040},
      doi          = {10.1063/1.4997953},
      url          = {https://juser.fz-juelich.de/record/836858},
}