Which of the following statement about electronic spectroscopy is not correct? (

Question

Which of the following statement about electronic spectroscopy is not correct?

(A)There are no vibrational selection rules in electronic transitions, so any delta v is possible.

(B) relative vibrational intensities arise from the Franck Condon (FC) factors

(C) Phosphorescence is much slower than fluorescence because it involves very weakly allowed triplet singlet transitions back to the ground state.

(D) In a given electronic transition, fluorescence occurs at a higher frequency than the corresponding absorption because of collisional deexcitation in the excited electronic state prior to fluorescence

Explanation / Answer

Solution :-

When light is absorbed then fluoroscence occures at the lower frequency because the emmited light has lower energy than the absorbed light

therefore the statement D is the incorrect statement.

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