Abstract
Dielectric relaxation of the ionic liquid, 1-ethyl-3-methylimidazolium ethyl sulfate (EMI+ETS-), is studied using molecular dynamics (MD) simulations. The collective dynamics of polarization arising from cations and anions are examined. Characteristics of the rovibrational and translational components of polarization dynamics are analyzed to understand their respective roles in the microwave and terahertz regions of dielectric relaxation. The MD results are compared with the experimental low-frequency spectrum of EMI+ETS-, obtained via ultrafast optical Kerr effect (OKE) measurements.
Highlights
Dielectric relaxation and the related conductivity of a condensed-phase system arise from molecular motions that modulate its local electric dipole moment.[1]
We examine the dielectric relaxation of 1-ethyl3-methylimidazolium ethyl sulfate (EMI+ETS−), one of the first Ionic liquids (ILs) commercially available
The microwave region of EMI+ETS− was studied via dielectric relaxation spectroscopy.[40]
Summary
Dielectric relaxation and the related conductivity of a condensed-phase system arise from molecular motions that modulate its local electric dipole moment.[1]. According to many simulation studies,[10−15] the collective reorientational and translational motions of the ions make differing contributions to the dielectric relaxation in the gigahertz and terahertz regions.
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