Molecules move within a structure, if they are pushed a little bit they will move to one side and then fall back towards their original position. Now depending on the molecular structure how quickly they fall back changes, if a second push comes along just as they are returning to their original position it can act like someone on a swing so the molecule moves further the second time. If these pushes continue to match the molecule swing they are making the molecule resonate. https://youtu.be/l2QVRkF0d2M
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