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@ARTICLE{Sackers:904073,
      author       = {Sackers, M. and Marchuk, O. and Ertmer, S. and Dickheuer,
                      S. and Czarnetzki, U. and Tsankov, Ts V and Luggenhölscher,
                      D. and Brezinsek, S. and Kreter, A.},
      title        = {{Z}eeman-resolved {TDLAS} using metastable levels of {A}r
                      in the weakly magnetized plasma of the linear plasma device
                      {PSI}-2},
      journal      = {Journal of physics / D},
      volume       = {54},
      number       = {39},
      issn         = {0022-3727},
      address      = {Bristol},
      publisher    = {IOP Publ.},
      reportid     = {FZJ-2021-05643},
      pages        = {395001 -},
      year         = {2021},
      abstract     = {Tunable diode laser absorption spectroscopy was applied at
                      the linear plasma device PSI-2 to measure the magnetic
                      field, temperature of argon and density of metastable
                      species in a low density gas discharge. The measurements on
                      the two metastable levels of Ar were performed by scanning
                      the plasma column of PSI-2 at different radii. The obtained
                      magnetic field using the lines at 763 and 772 nm (Ar) was
                      found to be systematically lower (by $5\%$ to $17\%)$ than
                      the calculated vacuum field. Part of the deviation arises
                      from the line integration of the absorption signal. The
                      radial gradient of the magnetic field strength combined with
                      the radial metastable density determines the magnitude of
                      this contribution $(2\%–3\%).$ The temperature of the
                      neutral gas was found to be essentially constant within the
                      discharge chamber. The gas temperature rises with increasing
                      cathode current and magnetic field due to an increase in the
                      plasma density and, consequently, an increase in the energy
                      transferred to the neutral gas by collisions with the
                      charged particles. The density of the 4 s metastable level
                      with J = 2 was found to be 8–9 times higher than that
                      of the level with J = 0 similarly to observations by
                      others in non-magnetized plasmas. To understand this trend a
                      simple collisional-radiative model for the metastable argon
                      4s J = 2 level was developed. Depending on the treatment
                      of the 4p levels it predicts a lower and an upper limit of
                      the metastable density. The experimental values are within
                      the limits predicted by the model indicating that the
                      complex kinetics of the excitation and deexcitation
                      collisional-radiative processes lead to this deviation from
                      the statistical equilibrium.},
      cin          = {IEK-4},
      ddc          = {530},
      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:000674467500001},
      doi          = {10.1088/1361-6463/ac0fa9},
      url          = {https://juser.fz-juelich.de/record/904073},
}