Fig. 9
Top: difference potential for the triplet transitions h − b (dashed blueline), i − b (dotted red line) of H-H compared to the X − C transition of H-He. Bottom: electric dipole transition moments between the triplet states of H-H. The h − b transition is forbidden asymptotically as it is a transition between the 2s and 1s states of the free hydrogen atom at large R.
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