Measurement of anisotropies of the kinetic energy and anharmonicity in pyrolytic graphite by neutron Compton scattering

Fielding, A.L., Timms, D.N., & Mayers, J. (1998) Measurement of anisotropies of the kinetic energy and anharmonicity in pyrolytic graphite by neutron Compton scattering. Europhysics Letters, 44(2), pp. 255-260.

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Neutron Compton scattering (NCS) measurements of the anisotropy of the momentum distribution and the mean Laplacian of the interatomic potential ∇2V have been performed using electron volt neutrons, with wave vector transfers between 24 Å−1 and 98 Å−1. The measured momentum distribution of the atoms displays significantly more anisotropy than a calculation using a model density of states. We have observed anisotropies in ∇2V for the first time. The results suggest that the atomic potential is harmonic within the graphite planes, but anharmonic for vibrations perpendicular to the planes.

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ID Code: 59131
Item Type: Journal Article
Refereed: Yes
Additional Information: Times Cited: 23
Fielding, AL Timms, DN MAyers, J
DOI: 10.1209/epl/i1998-00465-1
ISSN: 1286-4854
Subjects: Australian and New Zealand Standard Research Classification > PHYSICAL SCIENCES (020000) > CONDENSED MATTER PHYSICS (020400) > Condensed Matter Physics not elsewhere classified (020499)
Divisions: Current > Institutes > Institute of Health and Biomedical Innovation
Past > Schools > Physics
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Deposited On: 17 Apr 2013 22:50
Last Modified: 24 Apr 2013 05:58

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