TY - JOUR

T1 - Ewald sum corrections in simulations of ion and dipole solvation and electron transfer

AU - Matyushov, Dmitry V.

N1 - Funding Information:
This research was supported by the National Science Foundation (Grant No. CHE-1800243). The author is grateful to the anonymous reviewer for insightful comments.
Publisher Copyright:
© 2021 Author(s).

PY - 2021/9/21

Y1 - 2021/9/21

N2 - Periodic boundary conditions and Ewald sums used in standard simulation protocols require finite-size corrections when the total charge of the simulated system is nonzero. Corrections for ion solvation were introduced by Hummer, Pratt, and García, [J. Chem. Phys. 107, 9275 (1997)]. The latter approach is extended here to derive finite-size correction for the Stokes-shift and reorganization energy applied to electron-transfer reactions. The same correction term, scaling inversely with the box size, adds to the reorganization energy from the energy-gap variance but is subtracted from the reorganization energy calculated from the Stokes shift. Finite-size corrections thus widen the gap between these two quantities, which were recently found to diverge for protein electron transfer. Corrections to the free energy of dipole solvation and the variance of the electric field scale as m2/L3 with the solute dipole m and the box size L.

AB - Periodic boundary conditions and Ewald sums used in standard simulation protocols require finite-size corrections when the total charge of the simulated system is nonzero. Corrections for ion solvation were introduced by Hummer, Pratt, and García, [J. Chem. Phys. 107, 9275 (1997)]. The latter approach is extended here to derive finite-size correction for the Stokes-shift and reorganization energy applied to electron-transfer reactions. The same correction term, scaling inversely with the box size, adds to the reorganization energy from the energy-gap variance but is subtracted from the reorganization energy calculated from the Stokes shift. Finite-size corrections thus widen the gap between these two quantities, which were recently found to diverge for protein electron transfer. Corrections to the free energy of dipole solvation and the variance of the electric field scale as m2/L3 with the solute dipole m and the box size L.

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U2 - 10.1063/5.0061644

DO - 10.1063/5.0061644

M3 - Article

C2 - 34551535

AN - SCOPUS:85115304105

SN - 0021-9606

VL - 155

JO - Journal of Chemical Physics

JF - Journal of Chemical Physics

IS - 11

M1 - 114110

ER -