If vibrational motion of different chemical units of the same type gets correlated, then the vibration splits into several modes, each with a particular phase relation between the motion of the correlated units.

If vibrations of different molecules of the same type gets correlated, a similar splitting effect is observed. This is then called correlation field splitting and is commonly encountered in, e.g., molecular crystals (that is, crystals composed of molecules).


Do you notice the difference between these modes?



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