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Rotations, Vibrations and Structure in Solid C60: Investigations by Neutron Scattering

Published online by Cambridge University Press:  25 February 2011

W. A. Kamitakahara,
J. R. D. Copley,
R. L. Cappelletti,
J. J. Rush,
D. A. Neumann,
J. E. Fischer,
J. P. Mccauley Jr and
A. B. Smit III
W. A. Kamitakahara
Affiliation:
National Institute of Standards and Technology, Reactor Radiation Division, Gaithersburg, MD 20899
J. R. D. Copley
Affiliation:
National Institute of Standards and Technology, Reactor Radiation Division, Gaithersburg, MD 20899
R. L. Cappelletti
Affiliation:
Ohio University, Dept. of Physics and Astronomy, Athens, OH 45701
J. J. Rush
Affiliation:
National Institute of Standards and Technology, Reactor Radiation Division, Gaithersburg, MD 20899
D. A. Neumann
Affiliation:
National Institute of Standards and Technology, Reactor Radiation Division, Gaithersburg, MD 20899
J. E. Fischer
Affiliation:
University of Pennsylvania, Philadelphia, PA 19104
J. P. Mccauley Jr
Affiliation:
University of Pennsylvania, Philadelphia, PA 19104
A. B. Smit III
Affiliation:
University of Pennsylvania, Philadelphia, PA 19104
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Abstract

In a series of experiments on solid C60, the low-energy rotational dynamics of the molecules, the higher-energy vibrational spectra, and aspects of disorder in the static structure, have been studied. The nearly spherical shape of the C60 molecule, and the occurrence of an orientational phase transition at Tc=256 K, make the C60 solid an excellent system for investigations of orientational dynamics. Coherent quasi-elastic neutron scattering above Tc is described quantitatively by a rotational diffusion model. Below Tc, inelastic scattering froma soft librational mode is observed between 2 and 3 meV. Models of the strong, temperaturedependent diffuse scattering due to orientational disorder are discussed. Finally, measurements of the density of states for the intramolecular ( E ≥ 33 meV) vibrational modes are also presented.

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 270: Symposium M – Novel Forms of Carbon , 1992, 167
Copyright
Copyright © Materials Research Society 1992

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References

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