Lattice vibrations of gallium metal II. Experimental determination of the phonon dispersion relation

Abstract

The method of neutron inelastic scattering has been used to determine the phonon dispersion relation (12 branches) of gallium at 77 °K in the three main symmetry directions [ξ00], [0ξ0] and [00ξ]. To achieve this the so-called phonon structure factor was calculated, indicating as a function of position in reciprocal space the total intensity of the phonon peaks belonging to any particular irreducible representation.