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@ARTICLE{Gupta:824952,
      author       = {Gupta, S. and Mamontov, E. and Jalarvo, N. and Stingaciu,
                      L. and Ohl, M.},
      title        = {{C}haracteristic length scales of the secondary relaxations
                      in glass-forming glycerol},
      journal      = {The European physical journal / E},
      volume       = {39},
      number       = {3},
      issn         = {1292-895X},
      address      = {Berlin},
      publisher    = {Springer},
      reportid     = {FZJ-2016-07448},
      pages        = {40},
      year         = {2016},
      abstract     = {We investigate the secondary relaxations and their link to
                      the main structural relaxation in glass-forming liquids
                      using glycerol as a model system. We analyze the incoherent
                      neutron scattering signal dependence on the scattering
                      momentum transfer, Q , in order to obtain the characteristic
                      length scale for different secondary relaxations. Such a
                      capability of neutron scattering makes it somewhat unique
                      and highly complementary to the traditional techniques of
                      glass physics, such as light scattering and broadband
                      dielectric spectroscopy, which provide information on the
                      time scale, but not the length scales, of relaxation
                      processes. The choice of suitable neutron scattering
                      techniques depends on the time scale of the relaxation of
                      interest. We use neutron backscattering to identify the
                      characteristic length scale of 0.7 Å for the faster
                      secondary relaxation described in the framework of the
                      mode-coupling theory (MCT). Neutron spin-echo is employed to
                      probe the slower secondary relaxation of the excess wing
                      type at a low temperature ( ∼ 1.13Tg . The characteristic
                      length scale for this excess wing dynamics is approximately
                      4.7 Å. Besides the Q -dependence, the direct coupling of
                      neutron scattering signal to density fluctuation makes this
                      technique indispensable for measuring the length scale of
                      the microscopic relaxation dynamics.},
      cin          = {ICS-1 / Neutronenstreuung ; JCNS-1 / JCNS-SNS},
      ddc          = {530},
      cid          = {I:(DE-Juel1)ICS-1-20110106 / I:(DE-Juel1)JCNS-1-20110106 /
                      I:(DE-Juel1)JCNS-SNS-20110128},
      pnm          = {551 - Functional Macromolecules and Complexes (POF3-551) /
                      6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623)
                      / 6215 - Soft Matter, Health and Life Sciences (POF3-621)},
      pid          = {G:(DE-HGF)POF3-551 / G:(DE-HGF)POF3-6G4 /
                      G:(DE-HGF)POF3-6215},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000373171800003},
      doi          = {10.1140/epje/i2016-16040-7},
      url          = {https://juser.fz-juelich.de/record/824952},
}