The Modern Theory of Solids

absolute zero alkali metals alloys approximation assume atoms band cesium chloride Chap charge distribution classical coefficient cohesive energy components computed coordinates correlation corresponding curve d band D. R. Hartree Debye Debye's density derived determined discuss distance eigenfunctions equal exchange terms excited expression field Fock's equations free electrons frequency grad Hamiltonian Hartree Heitler-London Hence integral interaction interatomic ionic crystals ions kg cal/mol lattice levels lithium lowest magnetic mean value method modes molecular molecules normal number of electrons obtained one-electron functions Pauli principle phase Phys Physik potential Proc quantity quantum mechanics Rydberg units satisfy Schrödinger equation semi-conductors shown in Fig sodium chloride solid solutions specific heat spin surface symmetrical Table temperature theory tion total number transition unit cell valence electrons variables vector velocity vibration wave functions wave number Zincblende zone