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STAT A cubic cell consists of two atoms of masses m and m m m...

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STAT A cubic cell consists of two atoms of masses m and m m m with m and m atoms situated on alternate planes Assuming only nearest neighbor interactions the centre of mass of the two atoms a moves with the atoms in the optical mode and remains fixed in the acoustic mode 1 b remains fixed in the optical mode and moves with the atoms in the acoustic mode c remains fixed in both optical and acoustic modes BUR d moves with the atoms in both optical and acoustic modes

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