Molecular Dynamics using Non-variational Polarizable Force Fields: Theory, Periodic Boundary Conditions Implementation and Application to the Bond Capacity Model - Archive ouverte HAL Access content directly
Journal Articles Journal of Chemical Theory and Computation Year : 2019

Molecular Dynamics using Non-variational Polarizable Force Fields: Theory, Periodic Boundary Conditions Implementation and Application to the Bond Capacity Model

Abstract

We extend the framework for polarizable force fields to include the case where the electrostatic multipoles are not determined by a variational minimization of the electrostatic energy. Such models formally require that the polarization response is calculated for all electrostatic parameters for all possible geometrical perturbations in order to obtain the energy gradient required for performing molecular dynamics simulations. By making use of a Lagrange formalism, however, this computational demanding task can be replaced by solving a single equation similar to that for determining the polarization energy itself. Using the recently proposed bond capacity model that describes molecular polarization at the charge-only level, we show that the energy gradient for non-variational energy models with periodic boundary conditions can be calculated with a computational effort similar to that for variational polarization models. The possibility of separating the equation for calculating the electrostatic parameters from the energy expression depending on these parameters without a large computational penalty provides flexibility in the design of new force fields.

Dates and versions

hal-02299827 , version 1 (28-09-2019)

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Cite

Poier Pier Paolo, Louis Lagardère, Jean-Philip Piquemal, Frank Jensen. Molecular Dynamics using Non-variational Polarizable Force Fields: Theory, Periodic Boundary Conditions Implementation and Application to the Bond Capacity Model. Journal of Chemical Theory and Computation, 2019, ⟨10.1021/acs.jctc.9b00721⟩. ⟨hal-02299827⟩
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