Light And Matter Ia / Licht Und Materie Ia (handbuch Der Physik Encyclopedia Of Physics / Optik / Optics)

159 elements only between states which differ in one of the single-electron wave functions, in short, HeR induces only one-electron transitions. The matrix 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 r, =e nh\r , where n is the band index and U (r) has the periodicity of the lattice. The form of the Bloch function follows from the translational symmetry of the crystal, and the matrix elements between Bloch states are subject to the condition of wave-vector conservation: k'=k, for Front Matter....Pages II-VI Optical Constants and their Measurement....Pages 1-58 Phonons in Perfect Crystals....Pages 59-156 Photon-Electron Interaction, Crystals Without Fields....Pages 157-233 Magneto-Optics in Crystals....Pages 234-318 Back Matter....Pages 319-338