Abstract

The strongest features in the vacuum-ultraviolet (VUV) spectra of the diatomic halogens and interhalogens involve transitions from their ground states to excited Rydberg, ion-pair, and repulsive valence states. Rydberg-ion-pair (valence) state perturbations can manifest themselves in numerous ways, ranging from vibration al-level frequency shifts and intensity anomalies to strong adiabatic avoided crossings that lead to the formation of double-minima potential-energy curves. In many instances spectral interpretations have relied more heavily on calculations than on experiments because the high density of states and the presence of naturally occurring isotopomers lead to complex and highly congested spectra.

© 1994 Optical Society of America