Instantaneous Normal Mode Analysis of Supercooled Water

Details Instantaneous Normal Mode Analysis of Supercooled Water Instantaneous Normal Mode Analysis of Supercooled Water

1999-08-27

arxiv.org/abs/cond-mat/9908412v1

Physics

Condensed Matter

5 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.84.4605

We use the instantaneous normal mode approach to provide a description of the local curvature of the potential energy surface of a model for water. We focus on the region of the phase diagram in which the dynamics may be described by the mode-coupling theory. We find, surprisingly, that the diffusion constant depends mainly on the fraction of directions in configuration space connecting different local minima, supporting the conjecture that the dynamics are controlled by the geometric properties of configuration space. Furthermore, we find an unexpected relation between the number of basins accessed in equilibrium and the connectivity between them.

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