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@ARTICLE{Matveev:862841,
      author       = {Matveev, D. and Hansen, P. and Dittmar, T. and Koslowski,
                      H. R. and Linsmeier, Ch.},
      title        = {{M}odeling of {H}/{D} isotope-exchange in crystalline
                      beryllium},
      journal      = {Nuclear materials and energy},
      volume       = {20},
      issn         = {2352-1791},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier},
      reportid     = {FZJ-2019-03040},
      pages        = {100682 -},
      year         = {2019},
      abstract     = {A reaction-diffusion model with surface occupation
                      dependent desorption [D. Matveev et al., Nucl. Instr. Meth.
                      B 430 (2018) 23–30] has been updated to handle multiple
                      hydrogen species to simulate hydrogen/deuterium
                      isotope-exchange experiments performed on polycrystalline
                      beryllium samples under ultra-high vacuum laboratory
                      conditions. In the experiments subsequent exposures of a
                      sample to hydrogen and deuterium ion beams in direct and
                      reverse implantation order were followed by thermal
                      desorption spectroscopy measurements under a constant
                      heating rate of 0.7 K/s. The recorded signals of masses 2
                      to 4 (H2, HD and D2) indicate that the second implanted
                      isotope dominates clearly the low temperature release stage
                      ( ≈ 450 K), while both isotopes show a comparable
                      contribution to the high temperature desorption stage
                      ( ≈ 700 K) with only minor effect of the
                      implantation order attributed to a slightly deeper
                      penetration of deuterium compared to hydrogen. Simulations
                      of the implantation and subsequent thermal desorption of
                      hydrogen isotopes are performed to assess the atomic
                      processes behind the isotope-exchange. Simulations were
                      performed under the assumption that the low temperature
                      release stage is attributed to hydrogen/deuterium atoms
                      retained on effective open surfaces (e.g. interconnected
                      porosity) represented in the simulations by a surface with
                      an effective surface area exceeding the nominal exposed
                      surface area by a factor up to 100. Kinetic de-trapping from
                      vacancies with multiple trapping levels and enhanced
                      desorption at surface coverages close to saturation are
                      addressed in the model as possible mechanisms promoting the
                      isotope-exchange. Simulation results suggest the
                      applicability of the model to describe isotope-exchange
                      processes in crystalline beryllium and give a qualitative
                      explanation of the observed experimental facts.},
      cin          = {IEK-4},
      ddc          = {624},
      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:000500930800016},
      doi          = {10.1016/j.nme.2019.100682},
      url          = {https://juser.fz-juelich.de/record/862841},
}