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LATTICE VIBRATION 3 - Coggle Diagram
LATTICE VIBRATION 3
normal mode
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In the simplest approximation, we imagine that the atoms are attached to each other by a linear spring.
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In a normal mode, all of the atoms move with the same frequency
Normal mode is a pattern of motion in which all parts of the system move in a sinusoidal fashion, with the same frequency
normal mode frequencies of a chain of two types of atoms 
At A, the two atoms are oscillating in antiphase with their centre of mass at rest;
at B, the lighter mass m is oscillating and M is at rest;
at C, M is oscillating and m is at rest.
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