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| Title
| - Scaled Opposite Spin Second Order Møller−Plesset Theory with Improved PhysicalDescription of Long-Range Dispersion Interactions
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| Abstract
| - Separate scaling of the same-spin and opposite spin contributions to the second-order Møller−Plesset energycan yield statistically improved performance for a variety of chemical problems. If only the opposite spincontribution is scaled, it is also possible to reduce the computational complexity from fifth order to fourthorder in system size, with very little degradation of the results. However neither of these scaled MP2 energiesrecovers the full MP2 result for the dispersion energy of nonoverlapping systems. This deficiency is addressedin this work by using a distance-dependent scaling of the opposite spin correlation energy. The resultingmethod is compared against the previously proposed scaled MP2 methods on a range of problems involvingboth short and long-range interactions.
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