In Sect. 6.1.4, we calculated the ratio of the displacement amplitudes A and B for the long
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In Sect. 6.1.4, we calculated the ratio of the displacement amplitudes A and B for the long wave limit (k ! 0) for both the optical and acoustic phonon branches and then determined the displacement of the atoms with respect to each other. the ratio of the displacement amplitudes, in the short wave limit (k ! π/a), and draw the displacement of the atoms with respect to each other.
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