Although relaxed densities are required for reliable and quantitative excited-state property calculations, there is much qualitative information to be gleaned from the unrelaxed density. The CT nature of the donor → acceptor transition in the naphthalene:tetracyanoquinone dimer (Fig. ), for example, comes through in both the relaxed and unrelaxed dipole moments, even if orbital relaxation serves to delocalize both particle and hole across both monomers. Other examples considered below will neglect the Z-vector contribution, which is adequate for a quick survey of the nature of the predicted excited states.