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 A−1 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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