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Extra info for Liquid Crystals: Fundamentals
In addition, in the relaxation experiments when the equilibrium conditions are abruptly altered, the spectral profiles provide information on the characteristics of the molecular dynamics. The basic ideas behind magnetic resonance are common to both the nuclear magnetic resonance (nmr) and electron spin resonance (ESR), but the magnitudes and signs of the magnetic interactions involved differ in these two experiments which principally lead to the divergences in the experimental techniques used.
Tsykalo, Thermophysical Properties of Liquid Crystals (Gordon and Breach Science Publishers, New York, 1991). 29. A. Pikins, Structural Transformations in Liquid Crystals (Gordon and Breach Science Publishers, New York, 1991). C. Khoo, and F. , Physics of Liquid Crystalline Materials (Gordon and Breach Science Publishers, Amsterdam, 1991). 31. L. Lam, and J. , Solitons in Liquid Crystals (Springer-Verlag, New York, 1992). 32. S. N. , Phase Transitions in Liquid Crystals (Plenum Press, New York, 1992).
54) where Xap is an element of the susceptibility tensor x , a,P = x,y,z. When the field H is static, the tensor xap is symmetric (xap = Xp<0- In the isotropic phase, it has the simple form Xaf3 = X6 a p where 5 a p is the Kronecker delta. 55) X || ; a r e tr, e susceptibilities parallel and perpendicular to the symmetry axis, respectively. We can express x a s Xap=(X||+2xi)(Qap+j6ap) (2-56) with Qj = Ax/(x,| + 2 X ± ) and Q2 = 0, where Ax = X„ - X X denotes the anisotropy in the susceptibility.