A study of phase angles of the electric birefringence including inertia is proposed in the case of the simultaneous action of two electric fields, namely a direct current (dc) bias field added to an alternating current (ac) field of angular frequency ohgr;. The solution of the Fokkerndash;Planckndash;Kramers (FPK) equation applied to the orientational motion of a polar (permanent moment mgr;) and anisotropically polarizable (induced moment Dgr;agr;) molecule in twohyphen;dimensional (2D) space (disk model) leads to distinct phase angles thgr;1(ohgr;) and thgr;2(ohgr;), both of them corresponding to harmonic components in ohgr; and 2ohgr; of the birefringence. The evolution of the plots thgr;j(ohgr;), wherej=1,2, for different values of the inertial parametera2=tgr;I/tgr; and given a value ofP=(Dgr;agr;/mgr;2)kTis presented. It is shown that in the highhyphen;frequency region, the phase angles may take up to twice the values they would have with zero inertia. tgr;Iand tgr; are the friction time and the Debye relaxation time, respectively, whilekTstands for the usual thermal energy. Such variations must therefore be measurable by experiment and allow a new way of research in Kerr effect relaxation when inertia is taken into account.
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