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2$\begingroup$ In so many words, "what goes up must come down, and what is down can go up, and by the same distance too". $\endgroup$– NijCommented Jul 25, 2016 at 9:25
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$\begingroup$ Have a look at the Wikipedia page on the Franck-Condon principle here. $\endgroup$– a-cyclohexane-moleculeCommented Jul 25, 2016 at 13:57
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