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Java Phonon Applet

Transverse Optical and Acoustic Phonon Dispersion

Move the bottom slide bar to change the wavelength and move the top slide bar to vary the relative masses of the atoms.
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In the graph above, the energy of a phonon traveling perpendicular to the lattice planes for a solid with a two-atom basis (like salt) is calculated for a one-dimensional model.
The vertical green line indicates the wave vector (2 pi/lambda) times the size of the unit cell (two atom separation distances ). The value ka equal 1.57 (pi/2), corresponds to the first Brillouin zone boundary.
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Michael A. Lee and Kevin E. Schmidt
July 1, 2000