The ground and low-lying singlet and triplet states of acrolein, CH 2 CHCHO, have been studied with ab initio SCF methods *For the n + n singlet and triplet, the single/double bond character of the carbon-carbon bonds is interchanged with respect to the ground state.The ground and lowest excited singlet and triplet states are planar.
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Clifford E. Dykstra (1976) studied this question.