RADIATIVE TRANSITION PROBABILITIES FOR THE B-(1)PI(U)-]CHI-(1)SIGMA(G)(-BAND SYSTEM OF NA-2 EXCITED BY THE 4658-ANGSTROM LINE OF THE ARGON ION LASER())

The 4657.89 Angstrom line of a 12 W argon ion laser is used to excite the B-1 Pi(u)--> X(1) Sigma(g)(+) Na-2. Two new fluorescence Q series from B-1 Pi(u) levels (v' = 28, J' = 55) and (v' = 25, J' = 3) origina ting from (v'' = 9, J'' = 55) and (v'' = 9, J'' = 3), respectively, ar e observed together with R-P series (laser excitation: v'= 17, J' = 38 <-- v'' = 4, J'' = 39) known from earlier work. The absolute radiativ e transition probabilities and lifetimes are calculated from self-cons istent hybrid Perturbed Morse Oscillator (PMO)-Rydberg-Klein-Rees (RKR )-Long Range potential energy curves and ab initio transition dipole m oment function. These calculated transition probabilities agree reason ably with our laser-induced fluorescence results. Not only do the calc ulated Einstein A coefficients agree with measured relative fluorescen ce intensities, but also, when summed over final vibrational levels v' ', give precise lifetimes.