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Figure 4
Views of the mode 1 dispersion surface in the QxQy plane of the reciprocal lattice of aluminium, using the original Lennard-Jones potential (before fitting has been applied), with scattering intensity superimposed upon the frequency surface as a colour map. (a) An isometric projection of the dispersion surface. (b) A cross section through the plane from the Qx-axis perspective. (c) The view looking down on the plane. (d) A diagrammatic representation of the (hk0) plane in aluminium, showing for example the [420] direction (broken line). The two spheres in Q show the upper and lower values of Q for which one-phonon scattering can occur as a result of the condition |τ − q| < Q < |τ + q|.

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 46| Part 6| December 2013| Pages 1755-1770
https://doi.org/10.1107/S0021889813023728
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