Semiempirical calculations of energies, oscillator strengths, and rotational strengths for a number of singlet–singlet transitions of ethylene and of the twisted olefin trans-cyclo-octene are compared with experiments. The analysis shows that a minimum of three low-lying singlet states are required to explain the data considered: a B1xu(πz → πz*) responsible for the strong, broad olefinic absorption, a B1zu(πz → σ*)3s Rydberg state responsible for the olefin band with ε≅1000, and a B1xg(πz → πy*)3py Rydberg like state accounting for the low-lying electric quadrupole-allowed transition of ethylene and dominating the optical rotatory properties of the twisted double bond.
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Yaris et al. (1968) studied this question.
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