Preliminary results are reported on the inelastic scattering of low-energy (20 meV), monoenergetic (Δvv=0.8% full width at half maximum) He nozzle beams from a LiF(001) surface along the $〈100〉$ direction. The time-of-flight spectra reveal both broad and extremely sharp maxima. The broad maxima are attributed to a distribution of phonons of bulklike character with small momenta, while the sharp maxima indicate excitation of single discrete surface modes.
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Brusdeylins et al. (1980) studied this question.
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