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Transient Absorption Spectroscopy (TAS)
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Many proteins contain metal porphyrin molecules. The general structure of the porphyrin molecule is This molecule is planar and so we can approximate the πelectrons as being confined inside a square. What are the energy levels and degeneracies of a particle in a square of side a ? The porphyrin molecule has 26 πelectrons. If we approximate the length of the molecule by 1000 pm, then what is the predicted lowest energy absorption of the porphyrin molecule? (The experimental value is ≈17000 cm^-1.
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