Titlebook: Light and Matter Ia / Licht und Materie Ia; L. Genzel Book 1967 Springer-Verlag Berlin · Heidelberg 1967 Licht.Light.Materie.Matter.dynami

Custodian

Phonons in Perfect Crystals,plete, we have included sections (notably A and C) which cover much the same ground as was covered in the articles by . [.] and . [.]; where possible we have discussed the topics concerned from a different approach. In an Appendix we have summarised the principal features of the theory of thermodyna

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0085-140X ional symmetry of the crystal, and the matrix elements between Bloch states are subject to the condition of wave-vector conservation: k‘=k, for978-3-642-46076-0978-3-642-46074-6Series ISSN 0085-140X Series E-ISSN 2197-4195

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Foment

Book 1967atrix elements 1mn and Pmn reduce to matrix elements between the single-electron wave functions. We are interested primarily in crystalline solids for which the band model is a good approximation. The Bloch single-electron wave function in this model has the form: N‘I ili-‘;; U. r.;;) ( (1.14) ""nk

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Optical Constants and their Measurement,a large amount of information about the physical nature of the material. Because of the electric nature of the particles which make up the material, the electromagnetic wave is a natural handle with which to shake the material and thereby learn about its constitution; to find its resonance frequencies; to test its uniformity; etc.

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lethargy

Myelin

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Optical Constants and their Measurement,onstants, a pair for every frequency, measure the speed and the attenuation of the wave. These constants have value not only for describing the wave progress but also for their intimate relation to the fundamental constitution of the material. The frequency dependence of the optical constants gives

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