ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
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 ω. The solution of the Fokker–Planck–Kramers (FPK) equation applied to the orientational motion of a polar (permanent moment μ) and anisotropically polarizable (induced moment Δα) molecule in two-dimensional (2D) space (disk model) leads to distinct phase angles θ1(ω) and θ2(ω), both of them corresponding to harmonic components in ω and 2ω of the birefringence. The evolution of the plots θj(ω), where j=1,2, for different values of the inertial parameter a2=τI/τ and given a value of P=(Δα/μ2)kT is presented. It is shown that in the high-frequency region, the phase angles may take up to twice the values they would have with zero inertia. τI and τ are the friction time and the Debye relaxation time, respectively, while kT stands 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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.460929
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