When DFT or CC fails, then multireference methods are often the methods of choice in chemistry. In these methods one uses the “diagonalize-then-perturb” strategy, whereby the Hamiltonian is first ...

Multiconfiguration quantum chemical methods form a cornerstone of modern electronic structure theory, addressing the dual challenges of static and dynamic electron correlation. Traditional ...

Electronic structure analysis seeks to determine the arrangement and energies of electrons in molecules and materials, providing a foundation for understanding chemical reactivity, spectroscopic ...