MOLECULAR-DYNAMICS MODEL OF DIMETHYL ETHER

We report a molecular dynamics model of the monomeric liquid dimethyl ether. The united atom approach is used to treat CH3 groups as point f orce centers. Partial charges are derived from the experimental dipole moment. Harmonic force constants are used for intramolecular interact ions, and their values are so chosen that the model's fundamental freq uencies agree with experimental results. Because we are interested in solvation properties, the model contains flexible molecules, allowing molecular distortion and internal dynamical quantities. We report radi al distribution functions and static structure factors as well as some dynamical quantities such as the dynamical structure factor, infrared absorption, and Raman scattering spectra. Calculated results agree re asonably well with experimental and other simulation results.