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@ARTICLE{Ertmer:890505,
      author       = {Ertmer, Stephan and Marchuk, Oleksandr and Dickheuer, Sven
                      Oliver Oliver and Brezinsek, Sebastijan and Boerner, Petra
                      and Schmitz, Janina and Kreter, Arkadi},
      title        = {{M}easurements of the energy distribution of {W} atoms
                      sputtered by low energy {A}r ions using high-resolution
                      {D}oppler spectroscopy},
      journal      = {Plasma physics and controlled fusion},
      volume       = {63},
      number       = {1},
      issn         = {1361-6587},
      address      = {Bristol},
      publisher    = {IOP Publ.},
      reportid     = {FZJ-2021-01000},
      pages        = {015008},
      year         = {2021},
      abstract     = {Emission spectra of neural tungsten (W) sputtered by impact
                      of argon (Ar) ions in a weakly magnetized (<0.1 T) Ar plasma
                      were measured using a high resolution spectrometer at normal
                      incidence angle to the surface. The measurements were
                      performed for the mono-energetic impact energies between 70
                      and 150 eV using the neutral tungsten (W I) line at 4982.593
                      Å. The line shape of this line was simulated using a
                      Doppler-shifted emission model to determine the energy
                      distribution. Additional broadening mechanisms were taken
                      into account: instrumental broadening, Zeeman effect and
                      finally the photon or light reflectance at the W surface.The
                      obtained energy distribution was found in a very good
                      agreement with the Thompson distribution, even though
                      deviations for lower impact energies are observed, e.g. the
                      high-energy tail of sputtered particles demonstrates a
                      faster drop compared to 1/E2 at energies below 100 eV.
                      Moreover, the standard cosine (Knudsen cosine law)
                      distribution provides a rather good description of emission
                      spectra in the energy range of study. Finally, the energy
                      distribution was also compared with simulations carried out
                      with the binary collision approximation (BCA) based
                      Monte-Carlo code SDTrimSP. It shows a marginally worse
                      description at low energies and better description of the
                      high energy tail compared to the Thompson one. Furthermore,
                      the model was used to determine in-situ the degree of light
                      reflection at the W surface. The results are in excellent
                      agreement with the literature data.},
      cin          = {IEK-4},
      ddc          = {620},
      cid          = {I:(DE-Juel1)IEK-4-20101013},
      pnm          = {134 - Plasma-Wand-Wechselwirkung (POF4-134)},
      pid          = {G:(DE-HGF)POF4-134},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000590402800001},
      doi          = {10.1088/1361-6587/abc519},
      url          = {https://juser.fz-juelich.de/record/890505},
}