Numerical values of the pre-exponential factor

It is of interest to estimate likely values of the combined pre-exponential factor in eqn. (14) for outer-sphere reactions 

This can be compared with the values of A determined from the collisional treatment whereby on the basis of the simple gas-phase model [32] 

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Table 22.3 Numerical values of the pre-exponential factor A for solid-state reactions on first order at 400 K [2],...

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