Spectroscopic study of the B ~1II state of ~(39)KH

摘要

The B ~1II excited electronic state of ~(39)KH has been observed for the first time by a pulsed fluorescence excitation spectroscopic technique. We have found only one vibrational level, in which seven e-parity and seven f-parity sublevels are identified. The Dunham-type coefficients A_(00), A_(01), and A_(02) and the mean internuclear separation for the B ~1II state have been derived. Their numeric values are separately 27 682.64(1) cm~(-1), 1.533(1) cm~(-1), -0.001 25(2) cm~(-1), and 3.345(1) A for the B ~1II~+ state; 27 682.66(2) cm~(-1), 1.532(2) cm~(-1), -0.001 20(3) cm~(-1), and 3.347(2) A for the B ~1II state. The dissociation energy D0 is determined to be 131.4(7) cm~(-1). The vibrational frequency and the dissociation energy for the B ~1II state have also been estimated and the results are compared with recent ab initio calculations