Related Experiment Video
Updated: Mar 29, 2026

Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
Published on: April 12, 2019
Properties of a Method for Performing Adaptive, Multilevel QM Simulations of Complex Chemical Reactions in the
M Graham Guthrie1, April D Daigle1, Michael R Salazar1
1Department of Chemistry, Union University, 1050 Union University Drive, Jackson, Tennessee 38305 and Department of Chemistry, Dartmouth College, 6128 Burke Laboratory, Hanover, New Hampshire 03755.
Abstract:
The properties of a new method of performing molecular dynamic simulations of complex chemical processes are presented. The method is formulated to give a time-dependent, multilevel representation of the total potential that is derived from spatially resolved quantum mechanical regions. An illustrative simulation is performed on a 110 atom system to demonstrate the continuity and energy conserving properties of the method. The effect of a discontinuous total potential upon the kinetic energy of the system is examined. The discontinuities in the magnitude of atomic force vectors due to changing the electronic structure during the simulation are examined as well as the effect that these discontinuities have upon the atomic kinetic energies. The method, while not conserving total energy, does yield canonical (NVT) simulations. The time reversibility property of the simulation with an extremely discontinuous total potential is discussed. The computational scaling associated with the formation of the spatially resolved, time-dependent groups is also investigated.
More Related Videos
05:51Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method
Published on: July 19, 2019
07:31Author Spotlight: Advancing Cell Membrane Biophysics - Exploring Interactions and Challenges Through Experimental and Computational Approaches
Published on: September 1, 2023
Related Concept Videos
Reaction Mechanisms: Rate-limiting Step Approximation
Homogeneous Equilibria for Gaseous Reactions
For gas-phase reactions, the equilibrium constant may be expressed in terms of either the molar concentrations (Kc) or partial pressures (Kp) of the reactants and products. A relation between these two K values may be simply derived from the ideal gas equation and the definition of molarity. According to the ideal gas equation:
Coupled Reactions
Energy in adenosine triphosphate or ATP molecules is easily accessible to do work. ATP powers the majority of energy-requiring cellular reactions....
The Quantum-Mechanical Model of an Atom
Chemical Reactions in Aqueous Solutions
Chemical Equilibria: Systematic Approach to Equilibrium Calculations
The first step is to identify all the chemical reactions involved, The...