Molecular Rydberg transitions. VI. t r a n s-Dibromoethylene. The relation between vacuum ultraviolet and photoelectron spectroscopy

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Abstract
The vacuum ultraviolet absorption spectrum of trans-dibromoethylene is reported. Most of the extensive structure is assigned to four different Rydberg series, one of which converges on the first ionization limit, two of which converge on the second ionization limit and one of which converges on the fourth ionization limit. Much of the vibrational fine structure is associated with the first Rydberg series. The discussion focuses on the geometries of Rydberg and corresponding cationic states, on some aspects of the series fitting procedures, on the meaning of quantum defect values, and on selection rules.

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