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@ARTICLE{Chen:201070,
      author       = {Chen, W. C. and Gentile, T. R. and Ye, Q. and Walker, T. G.
                      and Babcock, E.},
      title        = {{O}n the limits of spin-exchange optical pumping of
                      $^{3}${H}e},
      journal      = {Journal of applied physics},
      volume       = {116},
      number       = {1},
      issn         = {1089-7550},
      address      = {Melville, NY},
      publisher    = {American Inst. of Physics},
      reportid     = {FZJ-2015-03380},
      pages        = {014903},
      year         = {2014},
      abstract     = {We have obtained improvement in the 3He polarization
                      achievable by spin-exchange optical pumping (SEOP). These
                      results were primarily obtained in large neutron spin filter
                      cells using diode bar lasers spectrally narrowed with
                      chirped volume holographic gratings. As compared to our past
                      results with lasers narrowed with diffraction gratings, we
                      have observed between $5\%$ and $11\%$ fractional increase
                      in the 3He polarization P He. We also report a comparable
                      improvement in P He for two small cells, for which we would
                      not have expected an increase from improved laser
                      performance. In particular, prior extensive studies had
                      indicated that the alkali-metal polarization was within
                      $3\%$ of unity in one of these cells. These results have
                      impact on understanding the maximum P He achievable by SEOP,
                      whether the origin of the improvement is from increased
                      alkali-metal polarization or decreased temperature-dependent
                      relaxation. We conclude that the most likely explanation for
                      the improvement in P He is increased alkali-metal
                      polarization. We have observed P He of between 0.80 and 0.85
                      in several large cells, which marks a new precedent for the
                      polarization achievable by SEOP.},
      cin          = {JCNS (München) ; Jülich Centre for Neutron Science JCNS
                      (München) ; JCNS-FRM-II / Neutronenstreuung ; JCNS-1 /
                      JCNS-2},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-1-20110106 / I:(DE-Juel1)JCNS-2-20110106},
      pnm          = {54G - JCNS (POF2-54G24)},
      pid          = {G:(DE-HGF)POF2-54G24},
      experiment   = {EXP:(DE-MLZ)NOSPEC-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000339621400065},
      doi          = {10.1063/1.4886583},
      url          = {https://juser.fz-juelich.de/record/201070},
}