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@ARTICLE{Pipich:1026694,
      author       = {Pipich, Vitaliy and Kohlbrecher, Joachim and Schwahn,
                      Dietmar},
      title        = {{T}hermal {D}ensity {F}luctuations and {P}olymorphic
                      {P}hase {T}ransitions of {E}thane ({C} 2 {D} 6 ) in the
                      {G}as/{L}iquid and {S}upercritical {S}tates},
      journal      = {The journal of physical chemistry / B},
      volume       = {128},
      number       = {20},
      issn         = {1520-6106},
      address      = {Washington, DC},
      publisher    = {Americal Chemical Society},
      reportid     = {FZJ-2024-03508},
      pages        = {5072 - 5082},
      year         = {2024},
      abstract     = {The phase behavior of the liquid C2D6 below and above the
                      critical point was investigated using small-angle neutron
                      scattering (SANS) in temperature and pressure ranges from 10
                      to 45 °C and 20 to 126 bar, respectively. The scattering of
                      thermal fluctuations of the molecular density was determined
                      and thus the gas–liquid and Widom lines. At the same time,
                      we observed additional scattering of droplets of more
                      densely packed C2D6 molecules above the gas–liquid line
                      and in the supercritical fluid regime from just below the
                      critical point for all temperatures at about ΔP = 10 bar
                      above the Widom line. This line is interpreted as the
                      Frenkel line. These results are consistent with our previous
                      studies on CO2 and thus indicate a universal phase behavior
                      for monomolecular liquids below and above the critical
                      point. The interpretation of the Frenkel line as the lower
                      limit of a polymorphic phase transition is in contrast to
                      the usual interpretation as the limit of a dynamic process.
                      The correlation lengths (ξ) of the thermal density
                      fluctuations at the critical point and at the Widom line are
                      determined between 20 and 35 Å and thus in the range of the
                      droplet radius between 60 and 80 Å. These long-range
                      fluctuations appear to suppress the formation of droplets,
                      which can only form at about 10 bar above the critical point
                      and the Widom line when ξ becomes smaller than 10 Å.},
      cin          = {JCNS-1 / JCNS-FRM-II},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JCNS-1-20110106 /
                      I:(DE-Juel1)JCNS-FRM-II-20110218},
      pnm          = {6G4 - Jülich Centre for Neutron Research (JCNS) (FZJ)
                      (POF4-6G4)},
      pid          = {G:(DE-HGF)POF4-6G4},
      experiment   = {EXP:(DE-MLZ)External-20140101},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {38747367},
      UT           = {WOS:001225962300001},
      doi          = {10.1021/acs.jpcb.4c01422},
      url          = {https://juser.fz-juelich.de/record/1026694},
}