Spectral reflectance of the one-dimensional organic metals (perylene)2(PF6)1.1 × 0.8CH2Cl2 and (perylene)2(AsF6)1.1 × 0.7CH2Cl2

We report on the optical reflectance of (perylene)₂(PF₆)_1.1 × 0.8CH₂Cl₂ and (perylene)₂(AsF₆)_1.1 × 0.7CH₂Cl₂ single crystals in the energy range from 0.25 to 4 eV. For light polarized perpendicular to the molecular stacks the crystals exhibit the optical behaviour of an insulating molecular crystals, whereas for light polarized parallel to the stacks a pronounced plasma edge at $\text{h}\text{?}\text{ω = 0.9}\text{eV}$ is observed. The experimental data were analyzed by a Lorentz-Drude model in order to determine the electrical conductivity, the carrier concentration, the effective mass, the collision time, the band width, and the Fermi vector of the crystals.