Fig. 4.
Configurational analysis of the three lowest-lying singlet excited states of B-1 based on MNDO-PSDCI calculations. Each excited state is described as a linear combination of single or double excitations with the percent contribution of configurations shown in the circle. Only configurations contributing 2% or more are shown. Configuration with gerade-like symmetry are labeled “g” and are shown in red, and those with ungerade-like symmetry are labeled “u” and are shown in blue. Doubly excited configurations have two source (hole circles) and destination (particle arrows) symbols. “%D” shows doubly excited character of each excited state.