The Ultraviolet Absorption Spectra of Cis- and Transdichloroethylenes

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Abstract
The absorption spectra of cis‐ and of transdichloroethylene have been photographed from the visible to 750A. There are continua in the quartz region and at short wavelengths, but discrete bands in the general region of 1300 to 1700A. Two Rydberg series have been found in the cis‐form predicting ionization potentials of 9.58 and 9.63 volts. A value in agreement with these figures is found by electron bombardment. No Rydberg series were found in the trans‐form, although indications of an ionization potential at about 11.3 volts were obtained by electron bombardment. In both forms the main progressions involve a C=C frequency of about 1400 cm—1, although many prominent differences involving the lowest deformation frequency have been found. A discussion of the various absorption regions has been given, although definite proof of many points must come from other sources.