The relative intensities of vibrational peaks in an electronic spectrum are determined by the Franck€“Condon factors. How would the potential curve for the excited state in Figure 25.2 need to be shifted along the distance axis for the n = 0 †’ n€² = 0 transition to have the highest intensity? The term n refers to the vibrational quantum number in the ground state, and n€² refers to the vibrational quantum number in the excited state.

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Excited state Latie 0-4 0-3 0+5 0+6 Frequency Ground state Distance R Energy E Intensity