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. Author manuscript; available in PMC: 2020 May 6.
Published in final edited form as: Annu Rev Biophys. 2019 Mar 27;48:371–394. doi: 10.1146/annurev-biophys-070317-033349

Figure 2.

Figure 2.

Electron cloud represented by fixed-charge model and polarization models. Both the induced point dipole and the Drude oscillator can represent the deformation of electron cloud. The fluctuating charge model can represent the re-distribution of charges within a molecule, while to represent the electron deformation of monoatomic ions and out-of-plane polarization, a dipole induction model is needed.