What Does PMP2 Stand For?

PMP2 stands for Spin Projected Moeller Plesset Second Order Perturbation Theory

PMP2, or Spin Projected Moeller Plesset Second Order Perturbation Theory, is a computational methodology used in quantum chemistry for the accurate description of electronic correlation effects in molecular systems. By applying spin projection techniques to the traditional Møller-Plesset perturbation theory at second order, PMP2 enhances the treatment of multi-reference character and provides improved results for systems where single-reference methods may fall short. This approach is particularly valuable for studying molecules with near-degenerate electronic states and facilitates a deeper understanding of their chemical properties and reactivity.