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In page Molecular dynamics:

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Chemistry force fields commonly employ preset bonding arrangements (an exception being ab initio dynamics), and thus are unable to model the process of chemical bond breaking and reactions explicitly. On the other hand, many of the potentials used in physics, such as those based on the bond order formalism can describe several different coordinations of a system and bond breaking.[1][2] Examples of such potentials include the Brenner potential[3] for hydrocarbons and its further developments for the C-Si-H[4] and C-O-H[5] systems. The ReaxFF potential[6] can be considered a fully reactive hybrid between bond order potentials and chemistry force fields.