A neutron inelastic scattering study has been made of the normal modes of vibration of molybdenum in a (11̄0) plane at room temperature using a cold-neutron chopper time-of-flight technique. The measured frequency---wave-vector results are in general agreement with the symmetry-axis data of Woods and Chen but show further anomalous behavior in several regions in this plane. The "normal" phonons (those not in anomalous regions) are fitted acceptably by Born---von Karman general force models that include at least six neighbors with a relatively large value for the sixth-neighbor force constant. The anomalous regions appear to be examples of Kohn anomalies, and two of these are interpreted on this basis to give information on dimensions of the near-planar sections of the Lomer model of the Fermi surface.
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Walker et al. (1969) studied this question.
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