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

Journal Article · Mon Dec 30 04:00:00 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), Journal Name: Physical Review Letters; (United States) Vol. 67:27; ISSN PRLTA; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

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