Free energy surfaces from nonequilibrium processes without work measurement

Details Free energy surfaces from nonequilibrium processes without work measurement Free energy surfaces from nonequilibrium processes without work measurement

2005-10-24

arxiv.org/abs/cond-mat/0510639v2

J. Chem. Phys. 124, 144111 (2006)

Physics

Condensed Matter

Statistical Mechanics

15 pages, 3 figures (1 color); accepted to J. Chem. Phys

Scientific paper

10.1063/1.2188946

Recent developments in statistical mechanics have allowed the estimation of equilibrium free energies from the statistics of work measurements during processes that drive the system out of equilibrium. Here a different class of processes is considered, wherein the system is prepared and released from a nonequilibrium state, and no external work is involved during its observation. For such ``clamp-and-release'' processes, a simple strategy for the estimation of equilibrium free energies is offered. The method is illustrated with numerical simulations, and analyzed in the context of tethered single-molecule experiments.

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