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@PHDTHESIS{Witt:51874,
      author       = {Witt, Richard},
      othercontributors = {Dölle, Andreas},
      title        = {{M}olekulare rotatorische {D}ynamik von {B}enzol und
                      {P}yridin in reiner {F}lüssigkeit und {B}enzol in einer
                      {P}olymerlösung},
      address      = {Aachen},
      publisher    = {Publikationsserver der RWTH Aachen University},
      reportid     = {RWTH-CONV-114123},
      pages        = {V, 74 S. : graph. Darst.},
      year         = {2000},
      note         = {Aachen, Techn. Hochsch., Diss., 2000},
      abstract     = {The model of rotational diffusion was used to describe the
                      rotational motion of benzene and pyridine in their neat
                      liquids as well as benzene in a solution containing
                      polystyrene. The three rotational diffusion constants cannot
                      be determined solely by conventional spin-lattice relaxation
                      measurements. In addition to conventional dipolar
                      13C-spin-lattice relaxation rates the cross correlation
                      rates between the dipolar and 'chemical-shift anisotropy'
                      mechanism were measured. Both relaxation pathways contain
                      all necessary information about the molecular dynamics. From
                      these rates the rotational diffusion constants were
                      calculated. The investigated temperature range for benzene
                      lay between 280 K and 323 K and for pyridine between 278 K
                      and 318 K. The benzene/polystyrene solution was investigated
                      at 298 K. Thus the activation parameters of reorientation
                      for the molecules in their neat liquids could be determined.
                      For both substances the motion about the 'out of plane' axis
                      is fastest. The reorientation about the two perpendicular
                      'in plane' axes for pyridine are different; the motion about
                      the axis through the nitrogene atom being slowest. The high
                      dipolar moment of pyridine is probably the cause for the
                      overall slower motion compared to that of the unpolar
                      benzene. The reorientation about the 'out of plane' axis
                      shows almost inertial behaviour whereas the motion about all
                      other axes is very well described by the model of rotational
                      diffusion.},
      cin          = {100000},
      ddc          = {540},
      cid          = {$I:(DE-82)100000_20140620$},
      typ          = {PUB:(DE-HGF)11},
      urn          = {urn:nbn:de:hbz:82-opus-817},
      url          = {https://publications.rwth-aachen.de/record/51874},
}