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Using four‐component (4c) relativistic spinors, we present a computationally economical relativistic ab initio method for molecular systems employing our recently proposed second‐order state‐specific multireference perturbation theory (SSMRPT) incorporating the improved virtual orbital‐complete active space configuration interaction (IVO‐CASCI) reference wavefunction. The resulting method, 4c‐IVO‐SSMRPT...
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