Potential effects on instantaneous normal modes of liquids

Ten-Ming Wu*, Wen Jong Ma, Shiow Fon Tsay

*Corresponding author for this work

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

We calculated the instantaneous-normal-mode (INM) densities of states for liquid Na, Lennard-Jones (LJ) liquid and truncated LJ liquid with the same reduced density and temperature by both molecular-dynamics simulation and the vector-random-walk approach under two-body approximation. By comparing the calculated results for these three liquids, we give some physical insights in the relationship between the INM density of state and the two-particle interaction potential. The effects of the short-range repulsive core, the long-range tail in the potential and the presence of attractive well are elucidated.

Original languageEnglish
Pages (from-to)257-271
Number of pages15
JournalPhysica A: Statistical Mechanics and its Applications
Volume254
Issue number1-2
DOIs
StatePublished - 15 May 1998

Keywords

  • Instantaneous normal modes
  • Pair potential
  • Random walk

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