While the integral in Eq. 45c can only be solved numerically, its dimensionlessness means that the result is a characteristic function (Eq. 45d) which can be incorporated in Eq. 43c. Eventually we find Eq. 46a, which can be solved iteratively to obtain an extraordinarily good approximation of the dimensionless scan rate from the peak separation, which then allows the calculation of the rate constant (Eq. 46b). Simpler relationships can be found for large (Eq. 46c-d) and small peak separations (Eq. 46e), somewhat like the Tafel and micropolarization exchange current density for steady state reactions.