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

Author： Fielding A. L.   Timms D. N.   Mayers J.  

Publisher： Edp Sciences

E-ISSN： 1286-4854|44|2|255-260

ISSN： 0295-5075

Source： EPL (EUROPHYSICS LETTERS), Vol.44, Iss.2, 2010-03, pp. : 255-260

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Abstract

Neutron Compton scattering (NCS) measurements of the anisotropy of themomentum distribution and the mean Laplacian of the interatomicpotential $\langle\nabla^2 V\rangle$ have been performed usingelectron volt neutrons, with wave vector transfers between $\rm24\;\AA^{-1}$ and $\rm 98\;\AA^{-1}$. The measured momentumdistribution of the atoms displays significantly more anisotropy thana calculation using a model density of states. We have observedanisotropies in $\langle\nabla^2 V\rangle$ for the first time. Theresults suggest that the atomic potential is harmonic within thegraphite planes, but anharmonic for vibrations perpendicular to theplanes.

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