Calculate dispersion relationship , maximum optical frequency , minimum optical frquency and the maximum acoustic frequency for transverse waves
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I am trying to find experimental value of acoustical phonon frequency of Al2O3. In the literature I found the most intense longitudinal optical bulk phonons is reported to be around kn=871 cm-1, from the expression ωexp_optical = kn.c where c is the speed of light I obtain a value ωexp_optical= 2.61 x 1013 sec-1. Is this the correct procedure? From here is it possible to estimate the acoustical phonon
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