Internal coordinate density of state from molecular dynamics simulation

Pin Kuang Lai, Shiang Tai Lin

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

The vibrational density of states (DoS), calculated from the Fourier transform of the velocity autocorrelation function, provides profound information regarding the structure and dynamic behavior of a system. However, it is often difficult to identify the exact vibrational mode associated with a specific frequency if the DoS is determined based on velocities in Cartesian coordinates. Here, the DoS is determined based on velocities in internal coordinates, calculated from Cartesian atomic velocities using a generalized Wilson's B-matrix. The DoS in internal coordinates allows for the correct detection of free dihedral rotations that may be mistaken as hindered rotation in Cartesian DoS. Furthermore, the pronounced enhancement of low frequency modes in Cartesian DoS for macromolecules should be attributed to the coupling of dihedral and angle motions. The internal DoS, thus deconvolutes the internal motions and provides fruitful insights to the dynamic behaviors of a system.

Original languageEnglish
Pages (from-to)507-517
Number of pages11
JournalJournal of Computational Chemistry
Volume36
Issue number8
DOIs
StatePublished - 30 Mar 2015

Keywords

  • Cartesian coordinates
  • Density of state
  • Internal coordinates
  • Molecular dynamics simulation
  • Normal modes
  • Velocity spectrum

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