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In the "free electron molecular orbital" (FEMO) theory, the electrons in a conjugated molecule are treated as independent particles in a box of length L. Predict the minimum excitation energy in butadiene.

The tetraene CH2=CHCH=CHCH=CHCH=CH2 can be treated as a box of length 8R, where R=140pm. Calculate the minimum excitation energy of the molecule.

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