| Issue |
Europhys. Lett.
Volume 44, Number 2, October II 1998
|
|
|---|---|---|
| Page(s) | 255 - 260 | |
| Section | Cross-disciplinary physics and related areas of science andtechnology | |
| DOI | https://doi.org/10.1209/epl/i1998-00465-1 | |
| Published online | 01 September 2002 | |
Measurement of anisotropies of the kinetic energy and anharmonicity in pyrolytic graphite by neutron Compton scattering
1
Division of Physics, Portsmouth University, St. Michael's Building, Portsmouth PO1 2DT, UK
2
ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, OX11 0QX, UK
Received:
2
February
1998
Accepted:
31
August
1998
Neutron Compton scattering (NCS) measurements of the anisotropy of the
momentum distribution and the mean Laplacian of the interatomic
potential 
have been performed using
electron volt neutrons, with wave vector transfers between 
and 
. 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 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.
PACS: 81.05.-t – Specific materials: fabrication, treatment, testing and analysis / 32.80.Cy – Atomic scattering, cross sections, and form factors; Compton scattering / 78.70.Nx – Neutron inelastic scattering
© EDP Sciences, 1998
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