The EXP pair-potential system. II. Fluid phase isomorphs

Andreas Kvist Bacher, Thomas Schrøder, Jeppe Dyre

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This paper continues the investigation of the exponentially repulsive EXP pair-potential system of Paper I [A. K. Bacher et al., J. Chem. Phys. 149, 114501 (2018)] with a focus on isomorphs in the low-temperature gas and liquid phases. As expected from the EXP system’s strong virial potential-energy correlations, the reduced-unit structure and dynamics are isomorph invariant to a good approximation. Three methods for generating isomorphs are compared: the small-step method that is exact in the limit of small density changes and two versions of the direct-isomorph-check method that allows for much larger density changes. Results from the latter two approximate methods are compared to those of the small-step method for each of the three isomorphs generated by 230 one percent density changes, covering one decade of density variation. Both approximate methods work well.
Original languageEnglish
Article number114502
JournalJournal of Chemical Physics
Issue number11
Number of pages13
Publication statusPublished - 18 Sep 2018

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