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Optical absorption and ESR spectra of metallic Na-doped (CH)x are reported. The results indicate chemical n-type doping with no free sodium metal in the film. Analysis of the data leads to estimates of the conductivity (σ?3×103 Ω−1 cm−1) and susceptibility (χp?1.6×10−6 emu/mol). The results imply that the metallic state in doped (CH)x is very similar for both p- and n-type dopant species.
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Chung et al. (1981) studied this question.
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