Abstract
We report the first use of an out-of-plane geometry for high resolution inelastic helium atom scattering. Measurements were made of surface phonons in LiF(001), concentrating in particular on the Ψ X azimuth in a search for the S 1 mode, which has a shear-horizontal polarization along this azimuth (rendering it invisible to in-plane scattering). Interactions with the Rayleigh (S 1 along Ψ M ) mode and pseudo-Rayleigh mode (S 7 along Ψ X ) dominate the helium time-of-flight spectra. We do not see any TOF peaks which can be attributed to the S 1 shear-horizontal mode. We do find evidence of the S 1–S 7 hybridization which occurs as the phonon wavevector is rotated from M to X .
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