However, these doubly excited states stabilize the ground state strongly and lead to calculated excitation energies that are too high. Nonetheless, energy differences between the states of interest are reliable. For AM1-CISD, the dependence of coupling on the spacer was demonstrated by calculating the splitting between different spin multiplicities of (T1T1), namely, 1 (T1T1), 3 (T1T1), and 5 (T1T1).