▎ 摘　　要

We compute the transmission of an electron through an impurity in polyacene. For simplicity the disorder is confined to a single unit cell. When the impurity preserves the inversion symmetry around the central axis, the scattering problem can be reduced to that of two independent chains with an alternating sequence of atoms of two types. An analytical expression for the transmission coefficient is derived. On-site and off-diagonal defects are considered and shown to display very different electron scattering properties.