Warning !

Soas is no longer maintained. You are strongly encouraged to switch to its successor, QSoas

ncli, with i = 1 to 9

The difference with the previous method is that now the two-electron peaks are fit to the equation derived by Laviron [7] (equivalent to eqs. (A5-A7) in ref [3]) adjusting the average two-electron reduction potential and the difference between the reduction potentials of each one-electron step (a negative value means that the two one-electron potentials are crossed).

The total current is the sum of the individual contributions of the centers:

$\displaystyle i_{\rm total}=\frac{F^2\nu A\Gamma}{RT}\sum_k \left( i_k \right)$ (3)

One-electron peaks are fit to:

$\displaystyle i_k=\frac{\exp\left[(F/RT)(E-E^k)\right]} {\left( 1+\exp\left[(F/RT)(E-E^k)\right] \right)^2}$ (4)

adjusting the one-electron reduction potentials $ E^k$. Two-electron peaks are fit to:
\begin{subeqnarray}
i_k &=& \sqrt{{K^k}}\frac{\sqrt{\xi^k} + 4/\sqrt {K^k} +1/\s...
... \right)\\
{\xi^k} & = & \exp\left(\frac {2F}{RT} E^k \right)
\end{subeqnarray}
adjusting the two-electron reduction potential $ E^k$, and the value of $ \Delta E^k$.

NB: the values of ns must equate 1 or 2, and must be FIXED during the fit.

You set the initial parameters following the instructions on screen: for each peak, you have to click where you guess its position is and enter the value of the stoichiometric number of electrons (1 or 2).

Warning !

Soas is no longer maintained. You are strongly encouraged to switch to its successor, QSoas
Christophe Leger 2009-02-24