Summary
We show that atomic natural orbitals are an excellent way to contract transition-metal basis sets, even though the different low-lying electronic states may have very different basis set requirements.
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Bauschlicher, C.W., Taylor, P.R. Atomic natural orbital basis sets for transition metals. Theoret. Chim. Acta 86, 13–24 (1993). https://doi.org/10.1007/BF01113513
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DOI: https://doi.org/10.1007/BF01113513