Krypton and the Fundamental Flaw of the Lennard-Jones Potential

Ciprian G. Pruteanu*, John S. Loveday, Graeme J. Ackland*, John E. Proctor

*Corresponding author for this work

Research output: Contribution to journalLetterpeer-review

Abstract / Description of output

We have performed a series of neutron scattering experiments on supercritical krypton. Our data and analysis allow us to characterize the Frenkel line crossover in this model monatomic fluid. The data from our measurements was analyzed using Empirical Potential Structure Refinement to determine the short- and medium-range structure of the fluids. We find evidence for several shells of neighbors which form approximately concentric rings of density about each atom. The ratio of second to first shell radius is significantly larger than in any crystal structure. Modeling krypton using a Lennard-Jones potential is shown to give significant errors, notably that the liquid is overstructured. The true potential appears to be longer ranged and with a softer core than the 6–12 powerlaws permit.
Original languageEnglish
Pages (from-to)8284-8289
Number of pages6
JournalJournal of Physical Chemistry Letters
Issue number35
Early online date29 Aug 2022
Publication statusPublished - 8 Sept 2022

Keywords / Materials (for Non-textual outputs)

  • Solid Krypton
  • State


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