On the 1795-Å Transition of 2-Methylpropene (Isobutene)

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Abstract
The absorption system originating around 1795 Å in isobutene has been studied in the parent compound and in three symmetrically deuterated isomers. Progressions are observed in the C=C stretch, –CH3 symmetric deformation, =CH2 deformation, =CH2 torsion, and =CH3 torsion vibrational modes. Sequences are observed in the =CH3 torsion and once in the =CH2 torsion. The ground- and upper-state methyl torsional potentials are calculated. The origin is tentatively identified as a false origin. The molecule is deduced to have undergone an extensive electronic change in the upper state. The transition is most probably A23py(σ*cc, b2)←π(px, b1).

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