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We report on a study of phonons in diamond using a new instrument for high resolution inelastic x-ray scattering at the Advanced Photon Source. We have paid particular attention to possible overbending of the most energetic branches, i.e., LO along both Γ-X ( ≡Δ) and Γ-L ( ≡Λ) and the elliptically polarized Σ₃ branch along Γ-K ( ≡Σ). Overbending along all three directions has been invoked in recent years to explain a famous and extraordinary peak in the two-phonon Raman spectrum. Our data reveal overbending only along Δ.
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Schwoerer‐Böhning et al. (1998) studied this question.
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