Abstract
Abstract The absorption spectra of azulene and 4,6,8-trimethylazulene are reported in the 1100–2200 A region. Two d-Rydberg series, both terminal on the first ionization potential I (I), are assigned. The lack of structure beyond the I (I) limit is attributed to autoionization events. The lowest-energy s- and p-Rydberg series members are expected to occur in the intravalence excitation region S 4 , S 3 , S 2 — S 0 and they may well be crucial to an interpretation of the spectroscopic peculiarities of this intravalence region.
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