Abstract
The B (1)Pi 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 (1)Pi 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 (1)Pi(+) 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 (1)Pi(-) state. The dissociation energy D(0) is determined to be 131.4(7) cm(-1). The vibrational frequency and the dissociation energy for the B (1)Pi state have also been estimated and the results are compared with recent ab initio calculations.
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