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Spectroscopic consequences of alkene pyramidalization have been investigated by measuring the triplet and singlet excitation energies of the pyramidalized alkene, tricyclo[3.3.3.0 3,7 ]undec-3(7)-ene (1), and the unpyramidalized reference alkene, bicyclo[3.3.0]oct-1(5)-ene (2), using electron-energy-loss spectroscopy. The experimental excitation energies and intensities are compared with the...