VACUUM-ULTRAVIOLET ABSORPTION AND FLUORESCENCE EXCITATION-SPECTRA OF ICL

Absorption and fluorescence excitation spectra for ICI in the vacuum-ultraviolet (125-195 nm) have been recorded using tunable synchrotron radiation. Fluorescence occurs mainly from the E(0+) ion-pair state, and pronounced resonance structure is observed. These resonances result from an unusual three-state interaction. Both homogeneous and heterogeneous coupling between the E(0+) ion-pair state and degenerate Rydberg states takes place. Pronounced broadening of the Rydberg levels occurs through heavy predissociation by a repulsive valence state or states. © 1990 American Chemical Society.