THOR+DVM Procedure: THOR+DVM is a general purpose molecular dynamics computer simulation package for the study of solids and biomolecular systems. It is based on a hybrid approach which makes use of Classical Molecular Dynamics (MD) and Stochastic Molecular Dynamics Monte Carlo (MC) simulations, coupled to Embedded Cluster Density Functional (ECDF) algorithms. In this scheme, parameterized interatomic potentials are used in MD/MC to relax the defect or interface structure, subject to constrains imposed by electron microscopy and other experimental data. See flowchart in Fig.1. The methodology used in our molecular dynamic approach is to run the MD program simultaneously with the DVM code. During the dynamic process the MD routine call the SCF-DVM program to redefine the atomic charge. In case of ionic crystals this kind of procedure is necessary to guarantee the time dependence of the atomic charge. In general, the results produced by the DVM code are used to adjust the classical force field. See flowchart in Fig.1. In parallel with this project we are developing a Stochastic Molecular Mechanics procedure, based on Monte Carlo method, to study some thermodynamic properties in crystals. In this case, random molecular geometries are calculated and used by the Simulated Annealing Method (GSA) to map the molecular energy hyper-surface, as well to study the atomic diffusion.

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  1. de Giambiagi, Myriam M.S.; Giambiagi, Mario; Fonseca, André Ricardo: About a certain dynamical system in molecular configuration space (1995)

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