Abstract
Abstract The linear dichroic absorption spectra of Pararosaniline (PR), Crystal Violet (CV), and Ethyl Violet (EV) were measured in the UV and visible regions by the stretched film technique. Poly(vinyl alcohol) was used as the film matrix. A method, which is expressed in the forms of reduced dichroism and dichroic ratio, was proposed for the analysis of the linear dichroism of disk-like molecules. The dyes PR, CV, and EV were shown to behave like disks regarding their orientation in the polymer matrix. The isotropic absorption spectra of PR, CV, and EV were resolved into the in-plane and out-of-plane polarized components by the reduction procedure. In each isotropic spectrum the out-of-plane component was found to overlap with the intense in-plane component in the UV and visible wavelength regions.
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