The mean-square amplitudes and mean-square velocities of vibration have been calculated for the (100) surface of NaCl with the Kellermann rigid-ion model. The calculated value of 〈uz²〉surface〈uz²〉bulk (the z direction being perpendicular to the surface) is only about 1.6 at high temperatures, as compared with calculated and experimental values ranging upward from about 2.0 for monatomic metals and noble-gas solids.
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Chen et al. (1972) studied this question.
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