Valence transitions in 1,3-cyclopentadiene, 1,3-cyclohexadiene, and 1,3-cycloheptadiene

Abstract
The 300–180 nm (4.1–6.9 eV) optical absorption and 4–10 eV (310–124 nm) electron energy loss spectra of 1,3‐cyclopentadiene, 1,3‐cyclohexadiene, and 1,3‐cycloheptadiene were measured. Three valence and several Rydberg transitions were observed in each molecule. The two strong, optically allowed valence transitions are interpreted as the NV1(B2) and NV3(A+1) transitions (states). The locations of the unobserved A1 states in cyclic dienes is discussed. Correlations are drawn between the three valence excited states observed here in each cis‐diene and those previously reported for trans‐butadiene.

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