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We report studies on the electronic structure of the methyl substituted poly(para-phenylene)-type ladder polymer (m-LPPP) using electromodulation-techniques. Electric fields from 10 kV/cm up to a few hundred kV/cm were applied to the samples either parallel or perpendicular to the incident light. The lineshape of the electroabsorption(EA)-spectra follows very closely the first derivative of the unperturbed...
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