Question

Electronic transitions are called vertical transitions. Comment. 

21 Jan 2026
Answer :
Word Count : 150
In spectroscopy, electronic transitions are termed vertical transitions because they occur on a timescale much faster than nuclear motion. According to the Franck–Condon principle, when an electron absorbs a photon and jumps from a lower to a higher electronic energy level, the positions of the nuclei in the molecule remain essentially
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