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We report the near-normal-incidence reflectivity spectrum of single-crystal TTF-TCNQ in the range 0.2-2.0 {μ}m. A Drude-like edge, persisting through the metal-insulator transition at 60^∘{}K, is observed near 1.3 {μ}m for light polarized parallel to the conducting axis. The temperature dependence of the optical parameters ε₀, τ, and ωₚ are discussed in conjunction with Hopfield's relation for the electron-phonon coupling constant.
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Grant et al. (1973) studied this question.
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