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

Autor:	D. N. Timms, Andrew Fielding, J Mayers
Rok vydání:	1998
Předmět:	Momentum Physics Anharmonicity Physics::Atomic and Molecular Clusters Compton scattering Density of states General Physics and Astronomy Interatomic potential Neutron Inelastic scattering Atomic physics Inelastic neutron scattering
Zdroj:	Europhysics Letters (EPL). 44:255-260
ISSN:	1286-4854 0295-5075
DOI:	10.1209/epl/i1998-00465-1
Popis:	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 A−1 and 98 A−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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::4db765c24159bf8f370a1c99d3c84f14 https://doi.org/10.1209/epl/i1998-00465-1 Zobrazit plný text záznamu