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Non-covalent interactions (NCIs) play a crucial role in biology, chemistry,material science, and everything in between. To improve pure quantum-chemicalsimulations of NCIs, we propose a methodology for constructing approximatecorrelation energies by combining an interpolation along the M{\o}lleradiabatic connection (MP AC) with a regularization and spin-scaling strategyapplied to MP2 correlation energies. This combination yields $c_{\rmos}\kappa_{\rm os}$-SPL2, which exhibits superior accuracy for NCIs compared toany of the individual strategies. With the $N^4$ formal scaling, $c_{\rmos}\kappa_{\rm os}$-SPL2, is competitive or often outperforms more expensivedispersion-corrected double hybrids for NCIs.The accuracy of $c_{\rmos}\kappa_{\rm os}$-SPL2 particularly shines for anionic halogen bondedcomplexes, where it surpasses standard dispersion-corrected DFT by a factor of3 to 5.

Regularized and Opposite spin-scaled functionals from M{\o}ller-Plesset adiabatic connection -- higher accuracy at lower cost