Abstract
Measurements are reported for photon energies between 0.5 and 11.8 eV of the absorption coefficient of thin films of free base, copper, and zinc phthalocyanines, chlorinated copper phthalocyanine, and free base protoporphyrin. Several new discrete transitions are observed in the ultraviolet spectra, in addition to a strong continuum component of absorption. The data covers a sufficiently extensive spectral range to permit the first determination of the spectral dependence of the optical constants for these materials.
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