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A lattice vibration of a crystal with two atom basis (represented by green and red dots). Pale chains represent the stationary position, while the red and green chain points are deflected: In the \(n\)-th lattice plane, one basis atom with mass \( m_2 \) is deflected by \(u_n\), while the other basis atom with mass \( m_1 \) is deflected by \( y_n \). Analogously with the other lattice planes, \(n+1\), \(n-1\) and so on.