Novel mechanism for temperature-independent transitions in flexible molecules: role of thermodynamic fluctuations

Details Novel mechanism for temperature-independent transitions in flexible molecules: role of thermodynamic fluctuations Novel mechanism for temperature-independent transitions in flexible molecules: role of thermodynamic fluctuations

2010-03-05

arxiv.org/abs/1003.1269v1

Physics

Condensed Matter

Statistical Mechanics

4 pages, 1 figure

Scientific paper

Novel physical mechanism is proposed for explanation of temperature-independent transition reactions in molecular systems. The mechanism becomes effective in the case of conformation transitions between quasi-isoenergetic molecular states. It is shown that at room temperatures, stochastic broadening of molecular energy levels predominates the energy of low frequency vibrations accompanying the transition. This leads to a cancellation of temperature dependence in the stochastically averaged rate constants. As an example, physical interpretation of temperature-independent onset of P2X_3 receptor desensitization in neuronal membranes is provided.

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