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The power-law reaction rate coefficient for barrierless reactions

The power-law reaction rate coefficient for the barrierless reactions is studied if the reactions take place in systems with power-law distributions, and a generalized rate formula for the barrierless reactions in Gorin model is derived. We show that due to barrierless, different from those for bimolecular and unimolcular reactions, the power-law rate coefficient for the barrierless reactions does not have the factor of power-law distribution function and thus it is not very strongly dependent on the nu-parameter. Four barrierless reactions are taken as the application examples to calculate the new rate coefficients, which with larger fitting nu-parameters can be exactly in agreement with the measurement values in experimental studies.