Abstract
In comparing the vacuum ultraviolet spectra of bromo- and iodoethylene with the spectra of their perfluoro analogs, it is noted that many of the absorptions are shifted in energy. Fluorine substitution has been found to stabilize the σ systems and increase the term values of (π, ns) Rydberg transitions, but to have little effect on π ionization potentials or p Rydberg term values. However, in these compounds, there are two (π, np) Rydberg series assigned, and the term values of one series associated with in-plane p Rydberg orbitals, showed a marked increase with fluorination. Additional substituent effects on halogen-π system interaction parameters have also been observed and are discussed.
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