Lattice vibrations in crystalline C70

van Loosdrecht, P. H. M.; Verheijen, M. A.; Meekes, H.; van Bentum, P. J. M.; Meijer, Gerard

doi:10.1103/PhysRevB.47.7610

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Lattice vibrations in crystalline C₇₀

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van Loosdrecht, P. H. M., Verheijen, M. A., Meekes, H., van Bentum, P. J. M., & Meijer, G. (1993). Lattice vibrations in crystalline C₇₀. Physical Review B, 47(12), 7610-7613. doi:10.1103/PhysRevB.47.7610.

Cite as: https://hdl.handle.net/21.11116/0000-000C-2247-E

Abstract

Raman spectroscopy in single-crystalline C₇₀ at low temperatures reveals a large number of Raman-active intramolecular modes, consistent with the selection rules and in agreement with theoretical predictions. Librational and vibrational lattice modes are observed in the low-frequency region of the spectrum, consistent with the selection rules for monoclinic P112₁/m-C₇₀. We discuss the lattice modes in terms of a simplified model of the crystal potential. Near 280 K we observe a phase transition, which is assigned to the order-disorder transition for the rotational motion around the long molecular axis.