The Far Ultraviolet Absorption Spectra of the Isomeric Butenes

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Abstract
Measurements of the intensity and position of absorption from 45 000 to 64 000 cm—1 of butene‐1, cis‐butene‐2, trans‐butene‐2, and 2‐methylpropene were made on flowing vapors. All show a broad intense band which is most intense in the case of the cis‐isomer, and superimposed systems of narrow bands, both at shorter and longer wavelengths. Whereas the position of the last named is dependent on the number of alkyl groups adjacent to the double bond, the broad band maximum is not similarly displaced but rather depends on the molecular shape and seems related to the dipole moment vector. The vibrational structure of the bands is consistent with infrared and Raman data.

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