Water molecules' performance under an external electric field is described by the Debye relaxation model [7, 25].
The Debye relaxation model can also be applied to describe complex permittivity of oil.
In the special case where [tau]' is constant, the ensemble response function is of the form exp (-t/[tau]') and we have classical Debye relaxation
To simplify this calculation, researchers have classified materials in different categories and there are three popular material dispersion models that are amenable to FDTD modeling : the Debye relaxation
, the Drude model, and the Lorentzian resonance.
It is well known that the [Chi][double prime] response function in a Debye relaxation
process is represented by a asymmetric loss peak around [[Omega].