Coherent quasielastic neutron scattering study of the rotational dynamics of C sub 60 in the orientationally disordered phase

Journal Article · Mon Dec 30 00:00:00 EST 1991 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.67.3808· OSTI ID:5100663

Neumann, D A; Copley, J R.D.; Cappelletti, R L; Kamitakahara, W A; Lindstrom, R M; Creegan, K M; Cox, D M; Romanow, W J; Coustel, N; McCauley, Jr, J P; Maliszewskyj, N C; Fischer, J E; Smith, III, A B ^[1]

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

Coherent quasielastic neutron scattering has been used to investigate the character of the rotational dynamics in the high-temperature solid phase of C{sub 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 {ital D}{sub {ital R}} is (1.4{plus minus}0.4){times}10{sup 10} s{sup {minus}1} at 260 K and (2.8{plus minus}0.8){times}10{sup 10} s{sup {minus}1} at 520 K. The temperature dependence of {ital D}{sub {ital R}} is consistent with a thermally activated process having an activation energy of 35{plus minus}15 meV.

• DOE Contract Number: FG02-86ER45254
• OSTI ID: 5100663
• Journal Information: Physical Review Letters; (United States), Vol. 67:27; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
FULLERENES
DIFFUSION
ROTATIONAL STATES
ACTIVATION ENERGY
MOLECULAR CRYSTALS
NEUTRON SPECTROSCOPY
PHASE TRANSFORMATIONS
QUASI-ELASTIC SCATTERING
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0273-0400 K
THERMODYNAMICS
CARBON
CRYSTALS
DIRECT REACTIONS
ELEMENTS
ENERGY
ENERGY LEVELS
EXCITED STATES
NONMETALS
NUCLEAR REACTIONS
QUASI-FREE REACTIONS
SCATTERING
SPECTROSCOPY
TEMPERATURE RANGE
360602* - Other Materials- Structure & Phase Studies