The Tamm Dancoff approximation (TDA) can be applied to the computation of excitation energies using time dependent Hartree Fock (TD HF) and time dependent density functional theory (TD DFT). In addition to simplifying the resulting response equations, the TDA has been shown to significantly improve the calculation of triplet excitation energies in these theories, largely overcoming issues associated with triplet instabilities of the underlying reference wave functions. Here, we examine the application of the TDA to the calculation of another response property involving triplet perturbations, namely the indirect nuclear spin spin coupling constant.
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