By T. C. McGill (auth.), Shashanka S. Mitra, Bernard Bendow (eds.)
Although a lot paintings has been played on degree ments and interpretation of sunshine absorption by way of opaque or approximately opaque solids, it truly is impressive to notice that till lately really little trustworthy experimental facts, and lots more and plenty much less theoretical paintings used to be on hand at the nature of obvious solids. This, besides the fact that an enormous majority of engineering and gadget ap plications of an outstanding rely on its optical transparency. understand that, all solids are either obvious and opa que counting on the spectral zone of attention. The absorption approaches that restrict the transparency of a high-quality are both as a result of lattice vibrations, as in ionic or partly ionic solids, or as a result of digital transi tions, either intrinsic and impurity-induced. for many fabrics, a sufficiently broad spectral window exists be tween those limits, the place the cloth is transpar ent. generally, the absorption coefficient, within the lengthy wavelength facet of, yet sufficiently clear of, the thrill damental absorption side, is comparatively structureless and has an exponential dependence on frequency. fresh evi dence means that within the brief wavelength facet of the one-phonon area, yet past - or three-phonon sin gularities, the absorption coefficient of either polar and nonpolar solids can also be really structureless and de pends exponentially on frequency.
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L. A. Harrington, M. B. Rosenstock, to be published. 33 VARIOUS FORMS OF THE ANHARMONIC POTENTIAL 5. M. J. Sham, Phys·. Rev. B ~, 3037 (1973). 6. B. P. C. Ying, Phys. Rev. B 10, 2286 (1974). 7. M. Sparks, Phys. Rev. B 10, 2581 (1974). 8. G. P. Tosi, J. Phys. Chern. 9. P. Tosi, Solid State Physics 16, 1 (1964). Solids~, 31 (1964). 10. L. Pauling, The Nature of the Chemical Bond (Cornell University Press, 1960). 11. C. W. Hellwarth. M. V. Winston, J. Phys. Chern. Solids 34, 2105 (1973). 12. L. A.
1]/w. , (11) J J' and the A are the vertex correction factors. m -1 -1-1 J Here ~ J is the Born charge, m = (m< ~) the reduced mass with m< and ~ the _ smaller afid larger of the ionic masses, respectively, and w=2TICV the photon frequency with the wavenumber. The multiple integrations in Eq. /kT. The parameters a and b are assumed to depend on J temperature, but not on frequency. Substitution of Eqs. (12) and 24 A. NEDOLUHA (13) in (11) allows to perform the integrations without resort to the central limit theorem.
DeWitt and R. Balian; Gordon and Breach, London, 1968) pp. 37ff. 25. G. Birnbaum and E. R. Cohen, J. Chern Phys. 53, 2885 (1970). 26. T. C. McGill and M. Chen, unpublished. ~, 133 (1973). MULTIPHONON ABSORPTION FOR VARIOUS FORMS OF THE ANHARMONIC POTENTIAL A. Nedo1uha Naval Electronics Laboratory Center San Diego, California 92152 Mu1tiphonon absorption in KC1 has been calculated by perturbation theory (including vertex corrections) for four forms of the anharmonic potential: (1) exponential Born potential, (2) exponential with preexponential power factor, (3) inverse power, (4) Morse potential.
Optical Properties of Highly Transparent Solids by T. C. McGill (auth.), Shashanka S. Mitra, Bernard Bendow (eds.)