Find the frequency for the optical mode at band center

Reference no: EM13339434

Consider a 1-D NaBr lattice. The frequency at the optical mode at k=pi/a is f=10.1THz. The atomic mass for Na is 22.99 and Br is 79.9. Calculate the frequency for the acoustical mode at the band edge (k=pi/a). Caculate the frequency for the optical mode at band center (k=0).

Reference no: EM13339434

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