Rotational dynamics and orientational melting of C sub 60 : A neutron scattering study

Well-defined librational excitations have been observed at energies of 2--3 meV in the low temperature ordered phase of solid C{sub 60}. These relatively high energies imply a stiff orientational potential below the transition. The sharpness of the peaks indicates that this potential does not depend...

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Bibliographic Details
Published in:The Journal of chemical physics 1992-06, Vol.96:11
Main Authors: Neumann, D.A., Copley, J.R.D., Kamitakahara, W.A., Rush, J.J., Cappelletti, R.L., Coustel, N., Fischer, J.E., McCauley, J.P. Jr, Smith, A.B. III, Creegan, K.M., Cox, D.M.
Format: Article
Language:English
Subjects:
664500 - Special Atoms & Molecules- (1992-)
ATOMIC AND MOLECULAR PHYSICS
BOND ANGLE
CARBON
COHERENT SCATTERING
DIFFRACTION
DYNAMICS
ELEMENTS
ENERGY DEPENDENCE
ENERGY LEVELS
EXCITED STATES
FULLERENES
MECHANICS
MELTING
NEUTRON DIFFRACTION
NONMETALS
ORIENTATION
PHASE TRANSFORMATIONS
ROTATIONAL STATES
SCATTERING
TEMPERATURE DEPENDENCE
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Summary:Well-defined librational excitations have been observed at energies of 2--3 meV in the low temperature ordered phase of solid C{sub 60}. These relatively high energies imply a stiff orientational potential below the transition. The sharpness of the peaks indicates that this potential does not depend strongly on the axis of the angular displacement. The modes soften and broaden as the temperature approaches that of the orientational melting transition which occurs when the librational amplitude is a considerable fraction of nearest-neighbor interatomic angles.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.462876