EMISSION-SPECTRUM OF THE CN(B2-SIGMA+-X2-SIGMA+) TAIL BAND SYSTEM - B2-SIGMA+APPROXIMATELY4-PI PERTURBATIONS IN THE V(B)=9, V(B)=12, AND V(B)=17 LEVEL

The CN(B(2)SIGMA+-X(2)SIGMA+) tail band system was observed in the reaction of argon metastable atoms with BrCN. The observed transitions in the 17-14 and 17-16 bands were analyzed in terms of the B(2)SIGMA+,upsilon = 17 approximately A (2)PI(inv),upsilon = 34 and (4)PI,upsilon = p + 11 perturbations, and the molecular constants for these levels and the interaction constants were determined. Intensity anomalies were also observed in the 9-8, 9-9, and 12-12 bands. The quantum numbers of the total angular momentum, J, of the perturbed rotational levels of B(2)SIGMA+ were assigned as (upsilon(B),N;J) = (9,56;55.5) and (12,10;10.5). The vibrational quantum number was determined as p = 0, and the crossing spin sublevels at the anomalies of upsilon(B) = 9 and 12 were determined as (4)PI(5/2) and (4)PI(1/2) by examination of the electronic part of the B(2)SIGMA+ approximately (4)PI perturbation constant, H(el)SO, for the (upsilon(B),upsilon(PI)) = (14,6) and (17,11) perturbations estimated by use of the Rydberg-Klein-Rees (RKR) potentials for B(2)SIGMA+ and (4)PI.