Abstract
Transients of electric birefringence are calculated for the electric field E ( t ) = E 0 cos ωt + E c where E 0 and E c are the strengths of ac and dc fields, respectively, ω is the angular frequency and t is time. A systematic study of the time-dependent behavior of the electric birefringence is presented in the form of numerous graphs for different values of the reduced frequency ω '= ω / D , D being the rotary diffusion constant, and the parameter x = E 0 / E c . Each graph is referred to by a particular value of P . which measures the influence of induced dipolar moments with respect to permanent dipolar moments. For high values of x , the well-known result obtained by Morita and Watanabe in the case of a pure sinusoidal field is found again. The interest of that theoretical study is evidenced by the determination of the molecular parameters P and D from the transient and quasi-steady-state. For that latter regime, an original method of phase angle measurements is proposed.
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