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Optical properties of polystyrene in the form of thin films were determined for photon energies between 0. 6 and 82 eV from transmission measurements. The results for k, the extinction coefficient, were combined with previous experimental results in the soft and hard x-ray regions up to 8050 eV. Analyses were made on several sum rules for the optical properties in this unusually wide energy range, including a sum rule for the refractive index n derived recently by Altarelli et al. Redistribution of the oscillator strength corresponding to 2. 7% of the total electrons was found between the valence and core excitations of carbon. Using the complex dielectric function and the energy-loss function obtained, the average photoexcitation energy and the average energy loss for fast-charged particles over the entire oscillator strength distribution were evaluated to be 25. 1 and 36. 8 eV, respectively.
Inagaki et al. (Tue,) studied this question.