Collective excitations in an ionic liquid.

Collective dynamics in a representative model of ionic liquids, namely, 1-butyl-3-methylimidazolium chloride, have been revealed by molecular dynamics simulation. Dispersion of energy excitation, ω versus k, of longitudinal acoustic (LA) and transverse acoustic (TA) modes was obtained in the wave vector range 0.17charge current spectra, branch with negative dispersion of ω versus k is a signature of optic modes in the simulated ionic liquid. Conductivity κ estimated by using ionic diffusion coefficients in the Nernst-Einstein equation is ...