Abstract
Abstract V. L. Broude et al.1 showed that optical contact mounting leads to a distortion of the optical properties of molecular crystals. The present paper compares and contrasts the true properties of freely mounted films of anthracene with those determined using the method of optical contact mounting. In addition, the temperature dependence of the polariton virtual mode absorption intensity has been determined for a freely mounted film and it is consistent with the mechanism of scattering (absorption) by acoustic phonons. From transmission and true absorption measurements with a very thin freely mounted film, it has been possible to determine for the first time the optical density profile of the surface exciton state previously observed by reflection and in fluorescence.
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