What Does SPUMPN Stand For?

SPUMPN stands for Single Annihilation Procedure Unrestricted Moeller Plesset Nth Order

SPUMPN, or Single Annihilation Procedure Unrestricted Moeller Plesset Nth Order, is a sophisticated computational method used in quantum chemistry. It enhances the accuracy of electronic structure calculations by employing an unrestricted version of the Moeller-Plesset perturbation theory, particularly at higher orders. This approach facilitates the treatment of electron correlation effects in complex systems, providing improved insights into molecular interactions and properties. SPUMPN is particularly valuable in exploring systems with unpaired electrons, thereby enabling researchers to model open-shell configurations effectively.