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Neutron Scattering Studies of C61H2

Published online by Cambridge University Press:  15 February 2011

D. A. Neumann ,
J. E. Fischer ,
J. R. D. Copley ,
P. A. Heiney ,
J. J. Rush ,
R. M. Strongin ,
L. Brard  and
Amos B. Smith III
D. A. Neumann
Affiliation:
National Institute of Standards and Technology, Gaithersburg, Maryland 20899
J. E. Fischer
Affiliation:
University of Pennsylvania, Philadelphia, Pennsylvania 19104
J. R. D. Copley
Affiliation:
National Institute of Standards and Technology, Gaithersburg, Maryland 20899
P. A. Heiney
Affiliation:
University of Pennsylvania, Philadelphia, Pennsylvania 19104
J. J. Rush
Affiliation:
National Institute of Standards and Technology, Gaithersburg, Maryland 20899
R. M. Strongin
Affiliation:
University of Pennsylvania, Philadelphia, Pennsylvania 19104
L. Brard
Affiliation:
University of Pennsylvania, Philadelphia, Pennsylvania 19104
Amos B. Smith III
Affiliation:
University of Pennsylvania, Philadelphia, Pennsylvania 19104
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Abstract

We report neutron diffraction measurements of orientational ordering, and inelastic neutron scattering measurements of the inter- and intra-molecular excitations, for the 6:5 annulene isomer (C3 symmetry) of C61H2. We confirm previous x-ray measurements[1] which have shown that above 290K this isomer has an fcc structure, with the molecules orientationally disordered such that the methylene groups preferentially occupy “octahedral” sites. Below 290K, the diffraction pattern can be indexed on a simple cubic lattice, in direct analogy with the orientational ordering transition of C60. The observed low energy dynamics reflect this behavior. A peak corresponding to molecular librations is observed below the transition, at ∼2.5meV, while above the transition the peak collapses into a quasielastic line characteristic of rotational diffusion. The intramolecular spectra show several pronounced peaks. The assignments of these modes are discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 359: Symposium G – Science and Technology of Fullerene Materials , 1994 , 537
Copyright
Copyright © Materials Research Society 1995

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References

REFERENCES

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