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Physical Chemistry

D.A. Neumann, J.R.D. Copley, R.L. Cappelletti, W.A. Kamitakahara, et al., "Coherent quasielastic neutron scattering study of the rotational dynamics of C60 in the orientationally disordered phase," Physical Review Letters, 67:3808, 1991. Dan Neumann (National Institute of Standards and Technology, Gaithersburg, Md.): "One of the most compelling features of the molecule C60 is its beautiful symmetric structure. On first reflection, however, there is an apparent paradox, since the molecular sha

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D.A. Neumann, J.R.D. Copley, R.L. Cappelletti, W.A. Kamitakahara, et al., "Coherent quasielastic neutron scattering study of the rotational dynamics of C60 in the orientationally disordered phase," Physical Review Letters, 67:3808, 1991.

Dan Neumann (National Institute of Standards and Technology, Gaithersburg, Md.): "One of the most compelling features of the molecule C60 is its beautiful symmetric structure. On first reflection, however, there is an apparent paradox, since the molecular shape, that of a truncated icosahedron, contains five- fold symmetry axes that cannot be ideally accommodated within a crystal structure. X-ray and neutron powder diffraction measurements, nevertheless, show that at room temperature solid C60 adopts a face-centered cubic structure.

"NMR results (C.S. Yannoni, et al., Journal of Physical Chemistry, 95:9, 1991; and R. Tycko, et al., J. Phys. Chem., 95:518, 1991) suggested the resolution of this difficulty by demonstrating that dynamic disorder in the orientations of the molecules exists at room temperature....

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