Improving computer models of chemistry by accounting for long-range electron interactions
In short: Researchers who use mean-field electronic structure methods, such as Hartree-Fock or density functional theory, often struggle to accurately model large chemical systems because these methods ignore London dispersion forces. This review highlights how adding specific dispersion corrections allows scientists to perform realistic calculations on complex molecules and crystals with high precision.
Because standard models fail to capture long-range electron correlation, researchers have developed three main correction schemes: nonlocal density-based functionals, semiclassical C6-based methods, and one-electron effective potentials. These additions are essential for understanding thermochemistry and the behavior of condensed matter.
The review evaluates these methods based on benchmarks of molecular complexes and crystals. While some areas like many-body effects still need improvement, current corrections typically achieve a relative error of only 5%, which is often more accurate than the underlying basic models themselves.
Why it matters: Adding specific corrections to standard computer models allows scientists to accurately simulate how complex molecules and materials behave.
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Sources
- Source: Research: Grimme et al. (2016). Dispersion-Corrected Mean-Field Electronic Structure Methods. Chemical Reviews. · other-oa
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