J,Ω,j, v$_{t}$ , v$_{d}$ ,Γ Energies above D$_{as}$ Binding energies 0,0,0,0,0, A ′ 1 1416.5 -126.2 0,0,0,1,0, A ′ 1 1474.1 -68.6 0,0,0,2,0, A ′ 1 1510.1 -32.6 0,0,0,3,0, A ′ 1 1530.2 -12.5 0,0,0,4,0, A ′ 1 1539.8 -2.9 0,0,0,5,0, A ′ 1 1542.7 -0.02 D$_{00}$ a ) 1542.7 0,0,1,0,0, A ′ 2 1419.9 -182.3 0,0,1,1,0, A ′ 2 1485.0 -117.2 0,0,1,2,0, A ′ 2 1532.0 -70.3 0,0,1,3,0, A ′ 2 1563.8 -38.5 0,0,1,4,0, A ′ 2 1583.7 -18.7 0,0,1,5,0, A ′ 2 1595.1 -7.2 0,0,1,6,0, A ′ 2 1600.6 -1.7 0,0,1,7,0, A ′ 2 1602.3 -0.01 D$_{01}$ b ) 1602.3 label the components: at large values of R , the component D$_{Z}$ is the largest of the two in magnitude and negative, D$_{X}$ being the smallest (in magnitude) and positive. The choice of negative D$_{Z}$ at large R corresponds to the Z axis oriented from the center of mass of the molecule towards the H − ion. For small values of R (for fixed γ and r ) the two components D$_{Z}$ and D$_{X}$ become comparable in magnitude. For such geometries they are identified by ensuring a smooth variation of the components with decreasing R . Notice that because the a ) Asymptotic energy of D − +D$_{2}$( v d = 0 ,j = 0) dissociation b ) Asymptotic energy of D − +D$_{2}$( v d = 0 ,j = 1) dissociation TABLE III: Energies (in cm − $^{1}$) of D − 3 bound levels obtained in the present study. Energies in the second column are given with respect to D$_{as}$ (see Table I, D$_{as}$ being the same for H − 3 and D − 3 ). The binding energies in the third column are given with respect to the dissociation limits D$_{00}$ for the A ′ 1 levels and D$_{01}$ for the A ′ 2 levels. The D$_{00}$ and D$_{01}$ dissociation D$_{2}$+D − limits are calculated with respect to D$_{as}$ and also given in the table. 19