A modification of the central-force model for liquid water is proposed; a spectroscopic potential is adapted to describe the intramolecular interactions. Gas-liquid shifts of internal vibrational frequencies obtained from MD simulations are in good agreement with available spectroscopic data.
An implemented potential of non-rigid water molecules for molecular dynamics simulations
β Scribed by Pierfranco Demontis; Giuseppe B. Suffritti; Ettore S. Fois; Aldo Gamba
- Publisher
- Elsevier Science
- Year
- 1986
- Tongue
- English
- Weight
- 491 KB
- Volume
- 127
- Category
- Article
- ISSN
- 0009-2614
No coin nor oath required. For personal study only.
β¦ Synopsis
The central force model for a water molecule is corrected by adding a three-body term. The present potential fits both an accurate ab initio potential energy surface and the fundamental vibrational frequencies of gas-phase water. The three-body terms allow us to reproduce the gas-phase IR spectrum by molecular dynamics simulations.
Some problems connected with MD simulations of IR spectra are discussed.
π SIMILAR VOLUMES
## Abstract A new method for performing molecular dynamics simulations with fluctuating charge polarizable potentials is introduced. In fluctuating charge models, polarizability is treated by allowing the partial charges to be variables, with values that are coupled to charges on the same molecule
Two molecular dynamics simulations, lasting 14 and 24 ps, have been performed with 150 water molecules between two walls. The waII potential is obtained by modeUing the wail as a lattice of fmed atoms, interacting with water atoms via a Lennard-Jones potential, and averaging the results. One simulat