% IMPORTANT: The following is UTF-8 encoded.  This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.

@ARTICLE{Press:18724,
      author       = {Press, W. and Krasnow, I. and Zamponi, M. and Prager, M.},
      title        = {{R}otational {T}unneling in {CH}4 {II}: disorder effects},
      journal      = {The journal of chemical physics},
      volume       = {135},
      issn         = {0021-9606},
      address      = {Melville, NY},
      publisher    = {American Institute of Physics},
      reportid     = {PreJuSER-18724},
      pages        = {224509},
      year         = {2011},
      note         = {A portion of this research at Oak Ridge National
                      Laboratory's Spallation Neutron Source was sponsored by the
                      Scientific User Facilities Division, Office of Basic Energy
                      Sciences, U. S. Department of Energy. Also in the name of
                      M.P., W.P. wishes to thank the Oak Ridge National Laboratory
                      and the members of the BASIS team for the warm welcome and
                      support. One of us (WP) is thankful to the Institut fur
                      Experimentelle und Angewandte Physik at the University of
                      Kiel for financial support of the measurement at SNS. We
                      would like to thank A. Heidemann and K. Maki for helpful
                      discussions and comments.},
      abstract     = {Transitions within the tunneling multiplet of CH(4) in
                      phase II have been measured in an experiment at the
                      backscattering instrument BASIS of the Neutron Source SNS.
                      They all involve transitions from or to T-states. A
                      statistical model is put forward which accounts for local
                      departures from tetrahedral symmetry at the sites of ordered
                      molecules. Different from previous work, in which discrete
                      sets of overlap matrix elements have been studied, now large
                      numbers of elements as well as the ensemble of T-states are
                      considered. The observed neutron spectra can be explained
                      rather well, all based on the pocket state formalism of A.
                      Hüller [Phys. Rev. B 16, 1844 (1977)]. A completely new
                      result is the observation and simulation of transitions
                      between T-states, which give rise to a double peaked feature
                      close to the elastic position and which reflect the disorder
                      in the system. CH(2)D(2) molecules in the CH(4) matrix are
                      largely responsible for the disorder and an interesting
                      topic for their own sake. The simple model presented may
                      lend itself to a broader application.},
      keywords     = {J (WoSType)},
      cin          = {ICS-1 / JCNS (München) ; Jülich Centre for Neutron
                      Science JCNS (München) ; JCNS-FRM-II / JCNS-1 / JCNS-2},
      ddc          = {540},
      cid          = {I:(DE-Juel1)ICS-1-20110106 /
                      I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-1-20110106 / I:(DE-Juel1)JCNS-2-20110106},
      pnm          = {BioSoft: Makromolekulare Systeme und biologische
                      Informationsverarbeitung / Großgeräte für die Forschung
                      mit Photonen, Neutronen und Ionen (PNI)},
      pid          = {G:(DE-Juel1)FUEK505 / G:(DE-Juel1)FUEK415},
      experiment   = {EXP:(DE-MLZ)External-20140101},
      shelfmark    = {Physics, Atomic, Molecular $\&$ Chemical},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:22168705},
      UT           = {WOS:000298250600033},
      doi          = {10.1063/1.3664726},
      url          = {https://juser.fz-juelich.de/record/18724},
}