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http://hdl.handle.net/2289/1194
Title: | Inequivalence of statistical ensembles in single molecule measurements |
Authors: | Sinha, Supurna Samuel, J. |
Issue Date: | 24-Feb-2005 |
Publisher: | The American Physical Society |
Citation: | Physical Review E, 2005, Vol.71, 021104 |
Abstract: | We study the role of fluctuations in single molecule experimental measurements of force-extension (f-zeta) curves. We use the wormlike chain (WLC) model to bring out the connection between the Helmholtz ensemble characterized by the free energy [F(zeta)] and the Gibbs ensemble characterized by the free energy [G(f)]. We consider the rigid rod limit of the WLC model as an instructive special case to bring out the issue of ensemble inequivalence. We point out the need for taking into account the free energy of transition when one goes from one ensemble to another. We also comment on the "phase transition" noticed in an isometric setup for semiflexible polymers and propose a realization of its thermodynamic limit. We present general arguments which rule out nonmonotonic force-extension curves in some ensembles and note that these do not apply to the isometric ensemble. |
URI: | http://hdl.handle.net/2289/1194 |
ISSN: | 1539-3755 1550-2376 (online) |
Alternative Location: | http://link.aps.org/abstract/PRE/v71/e021104 |
Copyright: | (2005) by the American Physical Society |
Appears in Collections: | Research Papers (TP) |
Files in This Item:
File | Description | Size | Format | |
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2005 PRE 71 p021104.pdf | 5p. | 56.88 kB | Adobe PDF | View/Open |
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