Coherent quasielastic neutron scattering study of the rotational dynamics of <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">C</mi></mrow><mrow><mn>60</mn></mrow></msub></mrow></math></span> in the orientationally disordered phase

D. A. Neumann; J. R. D. Copley; R. L. Cappelletti; W. A. Kamitakahara; R. M. Lindstrom; K. M. Creegan; D. M. Cox; W. J. Romanow; N. Coustel; J. P. McCauley, Jr; N. C. Maliszewskyj; J. E. Fischer; A. B. Smith, III

doi:10.1103/PhysRevLett.67.3808

Coherent quasielastic neutron scattering study of the rotational dynamics of $C_{60}$ in the orientationally disordered phase

D. A. Neumann, J. R. D. Copley, R. L. Cappelletti, W. A. Kamitakahara, R. M. Lindstrom, K. M. Creegan, D. M. Cox, W. J. Romanow, N. Coustel, J. P. McCauley, Jr., N. C. Maliszewskyj, J. E. Fischer, and A. B. Smith, III

Phys. Rev. Lett. 67, 3808 – Published 30 December 1991

Abstract

Coherent quasielastic neutron scattering has been used to investigate the character of the rotational dynamics in the high-temperature solid phase of $C_{60}$ . The observed scattering can be described by a model in which each molecule undergoes rotational diffusion which is uncorrelated with the motions of adjacent molecules. The rotational diffusion constant $D_{R}$ is (1.4±0.4)× $10^{10}$ $s^{- 1}$ at 260 K and (2.8±0.8)× $10^{10}$ $s^{- 1}$ at 520 K. The temperature dependence of $D_{R}$ is consistent with a thermally activated process having an activation energy of 35±15 meV.

Received 3 September 1991

DOI:https://doi.org/10.1103/PhysRevLett.67.3808

Authors & Affiliations

D. A. Neumann, J. R. D. Copley, R. L. Cappelletti, W. A. Kamitakahara, R. M. Lindstrom, K. M. Creegan, D. M. Cox, W. J. Romanow, N. Coustel, J. P. McCauley, Jr., N. C. Maliszewskyj, J. E. Fischer, and A. B. Smith, III

Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899
Department of Physics and Astronomy and Condensed Matter and Surface Sciences Program, Ohio University, Athens, Ohio 45701
Department of Physics, University of Maryland, College Park, Maryland 20742
Exxon Research and Engineering Company, Annandale, New Jersey 08801
Laboratory for Research on the Structure of Matter, University of Pennsylvania, Philadelphia, Pennsylvania 19104
Materials Science Department, University of Pennsylvania, Philadelphia, Pennsylvania 19104
Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104
Department of Physics, University of Pennsylvania, Philadelphia, Pennsylvania 19104