Abstract
Experimentally determined differences between the p-band absorption spectra of polycrystalline tetracene films and single crystals are shown to be caused by the oriented polycrystalline structure, which is described. The film spectra can be completely understood on the basis of single crystal absorption data when the measurement with unpolarized light and two wavelength-dependent diffraction effects are taken into account. These are due to the fact that a film composed of unisotropic microcrystals can act both as an amplitude and a phase grating.
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