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@ARTICLE{Marchuk:842059,
      author       = {Marchuk, Oleksandr and Brandt, Christian and Pospieszczyk,
                      A. and Reinhart, M. and Brezinsek, S. and Unterberg, B. and
                      Dickheuer, S.},
      title        = {{E}mission of fast hydrogen atoms at a plasma–solid
                      interface in a low density plasma containing noble gases},
      journal      = {Journal of physics / B},
      volume       = {51},
      number       = {2},
      issn         = {1361-6455},
      address      = {Bristol},
      publisher    = {IOP Publ.},
      reportid     = {FZJ-2018-00340},
      pages        = {025702 -},
      year         = {2018},
      abstract     = {The source of the broad radiation of fast hydrogen atoms in
                      plasmas containing noble gases remains one of the most
                      discussed problems relating to plasma–solid interface. In
                      this paper, we present a detailed study of Balmer lines
                      emission generated by fast hydrogen and deuterium atoms in
                      an energy range between 40 and 300 eV in a linear magnetised
                      plasma. The experiments were performed in gas mixtures
                      containing hydrogen or deuterium and one of the noble gases
                      (He, Ne, Ar, Kr or Xe). In the low-pressure regime
                      (0.01–0.1 Pa) of plasma operation emission is detected by
                      using high spectral and spatial resolution spectrometers at
                      different lines-of-sight for different target materials (C,
                      Fe, Rh, Pd, Ag and W). We observed the spatial evolution for
                      H α , H β and H γ lines with a resolution of 50 μm in
                      front of the targets, proving that emission is induced by
                      reflected atoms only. The strongest radiation of fast atoms
                      was observed in the case of Ar–D or Ar–H discharges. It
                      is a factor of five less in Kr–D plasma and an order of
                      magnitude less in other rare gas mixture plasmas. First, the
                      present work shows that the maximum of emission is achieved
                      for the kinetic energy of 70–120 eV/amu of fast atoms.
                      Second, the emission profile depends on the target material
                      as well as surface characteristics such as the particle
                      reflection, e.g. angular and energy distribution, and the
                      photon reflectivity. Finally, the source of emission of fast
                      atoms is narrowed down to two processes: excitation caused
                      by collisions with noble gas atoms in the ground state, and
                      excitation transfer between the metastable levels of argon
                      and the excited levels of hydrogen or deuterium.},
      cin          = {IEK-4},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IEK-4-20101013},
      pnm          = {174 - Plasma-Wall-Interaction (POF3-174)},
      pid          = {G:(DE-HGF)POF3-174},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000418673900002},
      doi          = {10.1088/1361-6455/aa987d},
      url          = {https://juser.fz-juelich.de/record/842059},
}