CALCULATION OF ROVIBRONIC STRUCTURES IN THE LOWEST 9 EXCITED (1)SIGMA(G)(-STATES OF H-2, D-2, AND T-2()+(1)PI(G)+(1)DELTA(G))

We have calculated the rovibronic structures which arise from the simu ltaneous radial and angular couplings among the lowest nine excited (1 ) Sigma(g)(+), (1) Pi(g), and (1) Delta(g) states in H-2, D-2, and T-2 . Using ab initio potential curves, adiabatic corrections, and nonadia batic coupling functions wherever possible, we have solved the coupled vibronic equations for all bound states below the 1s+2l dissociation limit up to J=5 in H-2 and D-2, and up to J=7 in T-2. The good agreeme nt of the bulk of the data with spectroscopic results enables us to el iminate spurious assignments in old spectroscopic work (e.g., all old assignments involving the 4s O (1) Sigma(g)(+) state are spurious), an d to make numerous new assignments. We present updated tables of spect roscopic term values for H-2 and D-2. The absolute energy errors of th e ab initio Born-Oppenheimer energies around the minima of the potenti al curves appear to be at most of the order of the radiative energy co rrections (similar or equal to 0.1 cm(-1)) in the states 1 sigma(g)2s sigma(g) E and (1 sigma(u))(2) F, less than 1 cm(-1) in the states 3d sigma G, 3s H, and 3d pi I, less than 2 cm(-1) in the 4s O state, and approximately 4 cm(-1) in the 4d sigma P state.