Stokes radius definition

By definition, the Stokes radius is obtained as the product of the anhydrous radius and the translational frictional ratio the translational frictional ratio has been measured for LDLs and found to be 1.11 (Fisher... 

Although many out of the hundreds of reactions in aqueous solution studied by pulse radiolysis are due to the secondary products such as OH-, there are also several hundred in which an oxidising agent is reduced by the solvated electron itself, before it has had time to react with the solvent, e.g., by addition e q -I- A" A" (cf. Section 1.2.3). In these reactions the solvated electron may be regarded as a distinct ionic entity, with a definite diffusion coefficient determined from the conductivity), and a radius r of about 3 A (calculated from the Stokes-Einstein equation. Section 1.2.3). The electron lies in a potential-energy trap ... 

The mobiUty of an ion is related to the velocity v and the electric field in which an ion is moving. The corresponding electric force, z e , accelerates the ion until the frictional drag exactly counterbalances the electric force. The frictional drag can be approximated from Stokes law as 6n//r v, in which tj is the viscosity of the solution, r is the radius of the ion, and v is the velocity. Using these equations and the definition of mobihty, namely, = vj , one then obtains... 

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