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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 

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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. 

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 

