The Modern Theory of Solids

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