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@ARTICLE{Paciaroni:890617,
      author       = {Paciaroni, A. and Comez, L. and Longo, M. and Sebastiani,
                      F. and Bianchi, F. and Orecchini, A. and Zanatta, M. and
                      Verbeni, R. and Bosak, A. and Sacchetti, F. and Petrillo,
                      C.},
      title        = {{T}erahertz collective dynamics of {DNA} as affected by
                      hydration and counterions},
      journal      = {Journal of molecular liquids},
      volume       = {318},
      issn         = {0167-7322},
      address      = {New York, NY [u.a.]},
      publisher    = {Elsevier},
      reportid     = {FZJ-2021-01077},
      pages        = {113956 -},
      year         = {2020},
      note         = {Kein Post-print vorhanden},
      abstract     = {Local and propagating vibrations occurring in DNA in the
                      terahertz domain are essential for processes at the basis of
                      cellular metabolism. Here we report the results of a study
                      on the B-DNA terahertz dynamics where we combined
                      high-resolution inelastic x-ray experiments and incoherent
                      inelastic neutron scattering. By using two different
                      high-hydration conditions we could study the effect of
                      packing interactions between double helices, while by
                      selecting Na and Cs counterions we could inspect how the
                      mass loading affects the DNA low-frequency modes. The
                      pattern of coherent excitation energies is well represented
                      in terms of two branches, an acoustic-like one, with an
                      associated propagation velocity of 3000 ± 100 m/s, and the
                      other almost dispersionless at ~2 meV. This picture is also
                      supported by the vibrational density of states projected on
                      the hydrogen atoms. The acoustic-like mode is assigned to
                      DNA excitations, despite its intriguing similarity with the
                      analogous acoustic mode of bulk water at low wave-vector
                      transfers. We also provide evidence for the intrahelical
                      optic-like character of the low-energy mode, that we ascribe
                      to large scale relative motions of DNA sub-domains.},
      cin          = {JCNS-FRM-II / JCNS-1 / JCNS-4},
      ddc          = {540},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-1-20110106 / I:(DE-Juel1)JCNS-4-20201012},
      pnm          = {632 - Materials – Quantum, Complex and Functional
                      Materials (POF4-632) / 6G4 - Jülich Centre for Neutron
                      Research (JCNS) (FZJ) (POF4-6G4) / 6215 - Soft Matter,
                      Health and Life Sciences (POF3-621) / 6G4 - Jülich Centre
                      for Neutron Research (JCNS) (POF3-623) / 6G15 - FRM II / MLZ
                      (POF3-6G15)},
      pid          = {G:(DE-HGF)POF4-632 / G:(DE-HGF)POF4-6G4 /
                      G:(DE-HGF)POF3-6215 / G:(DE-HGF)POF3-6G4 /
                      G:(DE-HGF)POF3-6G15},
      experiment   = {EXP:(DE-MLZ)External-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000583924900086},
      doi          = {10.1016/j.molliq.2020.113956},
      url          = {https://juser.fz-juelich.de/record/890617},
}