THE ELECTRONIC EXCITED-STATES OF BN

The a(1) Sigma(+)-X(3)II separation is estimated to be 180 +/- 110 cm( -1), which is in reasonable agreement with the recent experimental det ermination that the separation in a neon matrix is between 15 and 182 cm(-1). The calculated spectroscopic constants for the excited states confirm the experimental assignment for the triplet states below 30000 cm(-1) and two lowest singlet states. On the basis of a comparison of the computed results with those obtained from experiment, the compute d spectroscopic constants for the higher electronic states should be s ufficiently accurate to help in the assignment of future experiments.