Question: In formaldehyde, the transition n (T 1 ) occurs at 397 nm, and the n (S 1 ) transition comes at 355 nm.

In formaldehyde, the transition n → π*(T₁) occurs at 397 nm, and the n → π*(S₁) transition comes at 355 nm. What is the difference in energy (kJ/mol) between the S₁ and T₁ states? This difference is due to the different electron spins in the two states.

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