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Dispersion in the Linear and Second‐Order Bond Polarizabilities of Alkali Halides

“…In terms of the bond polarizability approach the coefficients p1 plz, and p44 are given by [9] 1 1 -8P"f" 1…”

“…The third one, more dispersive, describes the energy splitting contribution and becomes important near the resonant energy. The values of parameters used in (9) are listed in Table 2. The fits presented in Fig.…”

“…In the other approach the optical susceptibility is regarded as arising from bond polarizabilities. The bond polarizability approach has been widely used to study the optical properties of crystals and has been applied, for example, to the linear susceptibility [2 to 81, the elasto-optic effect [2,9 to 111, the second-and third-order nonlinear optical susceptibilities [3,12 to 181, the linear and quadratic electro-optic effects [19,201, the first-and second-order Raman effects [36], the detection of very small atomic displacements by polarization methods [21], and the first-and second-order strain derivatives of electronic dielectric constants [22]. Many of the theories were applied to alkali halides.…”