By S. Schnatterly (auth.), Jozef T. Devreese, Fons Brosens (eds.)
From July 20 until 31, 1981, the complicated research Institute on "Electron Correlations in Solids, Molecules and Atoms", subsidized by way of NATO, was once held on the college of Antwerpen (U.I.A.), within the convention heart Corsendonk. within the previous few years, the matter of many-electron correlations has won renewed recognition, because of contemporary experimental and theoretic al advancements. From the theoretical perspective, extra refined remedies of the homogeneous electron gasoline version advanced, together with dynamical elements of the electron correlation within the dielectric reaction. moreover, the homogeneous electron fuel, which served as a version for easy metals, was once prolonged to incorporate spin- and charge-density waves and phasons. the concept that of straight forward excitations too used to be brought not just in completely ordered steel crystals, but additionally in magnetic alloys, in liquid metals and alloys, in semiconductors, or even in molecules and atoms. particularly exact quantitative calculations of those results lately turned attainable, starting from plasmon frequencies in atoms, over dielectric reaction of semiconduc tors and resistivity in magnetic alloys to electron-hole drinks and their section separation. the hot technological evolution allowed for extra exact measurements in formerly unaccessible domain names, e.g. X-ray scatter ing and quickly electron strength loss at huge wavevector. in addition, those new advancements opened new views in physics, accompany ing or perhaps introducing the hot thoughts which additionally advanced within the theory.
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Extra info for Electron Correlations in Solids, Molecules, and Atoms
Scattering structure we desire. At higher energies the thicker sample shows a larger contribution which is due to double inelastic scattering. Comparison of different sample thicknesses serves as a check on the algorithm used in removing double scattering from the measured data. 2 Since the overall cross section varies as l/v where v is the fast electron velocity it is clearly advantageous to use as high a beam energy as possible. In addition rather thin sample 20 S. SCHNATTERLY ,.. ;. ,... ' -~:.
An applied perturbation with wave vector q can produce a response at q+G where G is any reciprocal lattice vector. Assuming a weak periodic field this problem can be described in the same way as that of non-interacting electrons in a periodic field : Bragg scattering occurs when a plasmon approaches the Brillouin Zone boundary, and gaps open up near the zone boundary  (See figure 21). Figure 22 shows an example of measurements in a single crystal sample of LiF. 5 eV disperses upward with q in a manner which depends on the orientation of q relative to the crystal axis.
14] K. Utsumi and S. Ichimaru, Phys. Rev. B22, 1522 (1980) and 4 subsequent papers in preprint form. M. Platzman and P. Eisenberger, Phys. Rev. Lett. 33, 152 (1974).  P. C. S. Lett. 45, 1439 (1980).  ~, ~1 2362 (1970). (1977). G. K. S. Singwi, Phys. Rev. Lett. 950 (1975). ~,  R. Girlanda, M. Parrinello and E. Tosatti, Phys. Rev. Lett. 36, 1386 (1976). P. J. Wuilleumier, ed. Y. 83. SCHNATTERLY  G. Wend in , "The Random Phase Approximation with Exchange" ibid. 61.  M. A. V. Chernysheva, Sov.