Two-phonon scattering in solid neon

Abstract

The dynamic form factor $S(\overrightarrow{\mathrm{Q}},\omega )$ appearing in the cross section for inelastic neutron scattering from phonons in solid neon at 5 K, is calculated using the self-consistent phonon theory. Comparison of the computed $S(\overrightarrow{\mathrm{Q}},\omega )$ with the scattering intensities observed by Skalyo et al. shows that the unusually shaped phonon groups they found for high-frequency phonons in neon is due to an unusually large and frequency-dependent two-phonon scattering component.