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S. D. Traytak
[J. Phys. Chem., Vol. 98(31), pp.7419-7421 1994]
A simple analytic approximations for the time-dependent rate constant in the diffusion-controlled reactions between particles with isotropic reactivity and axially symmetric active site has been derived. It is shown that in the general case the definition of the effective steric factor depends on time and the size of active site.