ON THE ULTRAVIOLET SPECTRUM OF ISOBUTENE

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1976

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Ohio State University

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The ultraviolet absorption spectra of isobutene and isobutene-$d_{8}$ have been measured between 1800 and 1300 {\AA}. (From the blue of the main - $\Pi \rightarrow \Pi^{*}$ system to the first ionization.) To the blue of the relatively sharp, structured band at $\sim 1488$ {\AA} $(67~173 cm^{-1})$the spectrum is composed of structured Rydberg bands. Most of these are members of a d-Rydberg series $(\delta \sim 0.12)$. Between the $\sim$ 1488 {\AA} band and the 1790 {\AA} band previously $analyzed^{1}$ there are several diffuse transitions. The relative intensities of these transitions differ in the -$h_{8}$ and -$d_{8}$ substituted molecules. Probable assignments for these transitions will be discussed.

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$^{1}$R. McDiarmid, J. Chem. Phys. 55, 2426 (1971).
Author Institution: National Institutes of Health, NIAMDD-LCP

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