Evidence for orientational tunneling of CO intercalated in C60: a nuclear 
magnetic resonance study.

Tomaselli, M.; Knecht, D. W.; Holleman, I.; Meijer, Gerard; Meier, B. H.

doi:10.1063/1.1312866

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Evidence for orientational tunneling of CO intercalated in C₆₀: a nuclear magnetic resonance study.

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Tomaselli, M., Knecht, D. W., Holleman, I., Meijer, G., & Meier, B. H. (2000). Evidence for orientational tunneling of CO intercalated in C₆₀: a nuclear magnetic resonance study. The Journal of Chemical Physics, 113(13), 5141-5144. doi:10.1063/1.1312866.

Cite as: https://hdl.handle.net/21.11116/0000-000B-6440-C

Abstract

We characterize the low-temperature dynamics of CO intercalated in C₆₀ using NMR spectroscopy. CO in C₆₀ is found to be dynamically inhomogeneous below 30 K: The ¹³ CO line shapes reflect a dynamic disorder to static disorder transition, with only quantum tunneling among equivalent orientations in a local S₆ symmetry potential remaining. The increased hindrance of the CO motion cannot be reconciled with common expectations of a homogeneous, thermally activated jumplike reorientation process, but is well accounted for in a model of orientational pinning due to asymmetric distortions of the cage potential.