Jun 5, 2019 ... ΔE for this electronic transition is 258 kcal/mol, corresponding to light with a ... our
isolated pi-bond example, we see that the HOMO-LUMO energy gap is ... gives
rise to a strong UV absorbance at 236 nm due to a π - π* transition. .... other
words, the distance that the beam of light travels though the sample.
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