Measurements of the dispersion curves on single crystals of NbD0.85 and NbH0.82 reveal two new excitations at ω=18.4 and 10.8 meV. The positions of these excitations are independent of temperature and mass of the light atom, but the linewidth is broader in the α^' solid-solution phase than in the β phase, and broader in the hydrogen system than in the deuterium system.
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Shapiro et al. (1978) studied this question.
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