Structure of the medium studied here

The metal phase (see section A1.2) with uniform temperature T and electron concentration Q (number of moles per unit volume), is characterized by a classic Ohm law (resistivity R). 

At the interface, the surface concentration, in terms of active sites, expressed in number of moles per unit area, is supposed to be constant. By writing the laws of classic chemical kinetics for reactions (I), (II) and (III), we obtain the expression of the surface concentration of the electrons and an initial expression of the intensity / of the electrical current  

2 This is a choice. However, other reactive schemas are possible within the sheath (see section 7.4). 

The values denote the specific reaction rates in the direction (adsorption) or s (desorption) the C. values denote the concentrations of the species in the le plasma (molesArolume) 5V is Avogadro s number (-e) the charge on the electron. 

The plasma is supposed to be at collisional chemical equilibrium, and such that the Debye length (equation [7.3]) is much larger than the mean free path of the charged species l, which justifies a collisional approach to the 

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