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@ARTICLE{Emondts:836100,
      author       = {Emondts, M. and Colell, J. and Blümich, B. and Schleker,
                      Peter Philipp Maria},
      title        = {{P}olarization {T}ransfer {E}fficiency in {PHIP}
                      {E}xperiments},
      journal      = {Physical chemistry, chemical physics},
      volume       = {19},
      number       = {33},
      issn         = {1463-9084},
      address      = {Cambridge},
      publisher    = {RSC Publ.},
      reportid     = {FZJ-2017-05224},
      pages        = {21933-21937},
      year         = {2017},
      abstract     = {Parahydrogen induced polarization (PHIP) is a
                      hyperpolarization method for NMR signal enhancement with
                      applications in spectroscopy and imaging. Although
                      parahydrogen can be easily enriched up to nearly $95\%,$ the
                      polarization detected on the hydrogenated substrate is
                      substantially lower, where numerous loss mechanisms between
                      the start of the hydrogenation reaction and detection affect
                      polarization levels. The quality of PHIP systems is commonly
                      determined by stating either the polarization degree or the
                      enhancement factor of the product at the time of detection.
                      In this study, we present a method that allows the
                      distinction of polarization loss due to both the catalytic
                      cycle and T1 relaxation of the formed product prior to
                      detection. We determine the influence of homogeneous
                      catalysts and define a rigorous measure of the polarization
                      transfer efficiency (PTE). Our results show that the PTE
                      strongly depends on the concentration of all components and
                      the chemical structure of the catalyst as well as on the
                      magnetic field of detection.},
      cin          = {IEK-9},
      ddc          = {540},
      cid          = {I:(DE-Juel1)IEK-9-20110218},
      pnm          = {131 - Electrochemical Storage (POF3-131)},
      pid          = {G:(DE-HGF)POF3-131},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000408257700002},
      doi          = {10.1039/C7CP04296E},
      url          = {https://juser.fz-juelich.de/record/836100},
}