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The power-law TST reaction rate coefficient for an elementary bimolecularreaction is studied when the reaction takes place in a nonequilibrium systemwith power-law distributions. We derive a generalized TST rate coefficient,which not only depends on a power-law parameter but also on the reactioncoordinate frequency of transition state. The numerical analyses show a verystrong dependence of TST rate coefficient on the power-law parameter, andclearly indicate that a tiny deviation from unity in the parameter (thus fromthe Boltzmann-Gibbs distribution) would result in significant changes in therate coefficient. We take an elementary F+H2 reaction as an application exampleto calculate the reaction rate coefficient, and yield the rate values beingexactly agreement with the measurement values in all the experimental studiesin temperature range 190~765K.

The power-law reaction rate coefficient for an elementary bimolecular reaction