EXCITONS IN A POLYENE CHAIN

Using a simple one-dimensional model hamiltonian the polyene band structure is calculated in the Hartree-Fock approximation. As a consequence the generalised linear response function is calculated in the random phase approximation. The poles of this function are identified as the energies of excitions separated off below the electron-hole continuum. Because of the simple nature of the hamiltonian the calculations can be performed analytically. © 1978.