Translational symmetry Atomistics 1 Backscattering 1 Band theory 1 Chains length 1 Delocalized electron 1 Eigenvalues and eigenfunctions 1 Electron backscattering 1 Electrons 1 Finite chains 1 Harmonic analysis 1 Harmonic yields 1 High order harmonics 1 High order harmonics generation 1 Higher order harmonics 1 Intuitive understanding 1 Localised 1 Machinery 1 Molecular orbitals 1 Molecular polarizabilities 1 Optical lattices 1 Optical- 1 Susceptibility tensors 1 Tensors 1 Topological bands 1 Topological obstructions 1 Topology 1 Wannier functions 1