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with respect to their first allowed dissociation limit v$_{d}$ = 0 , j = 1. It is worth noticing that our binding energies for all levels but one are larger than the energies of Ref. [10]), expressing that the well depth of our potential surface is found about 17 cm − 1 deeper than in Ref. [10]). The last bound level of the A ′ 1 irrep has a very small binding energy and may not be fully converged. The bound state energies of D − 3 are given in Table III. Since the D − 3 molecule is heavier than H − 3 , it has more vibrational levels. No data from previous calculation is available for D − 3 . 

