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Normal modes refer to fundamental patterns of motion of a system which oscillate at fixed, well defined frequencies. They may be used as building blocks for more complicated motions.

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Normal modes: how to get reduced masses from displacement vectors, atomic masses and vibrati...

It's been a long time since I dealt with normal modes (and it was on a completely different system), so I hope I won't get this completely wrong :-) First of all, the two equations you write at the e …
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