An @A00424@ that is characteristic of a charge-transfer process and the experimental conditions (such as the composition of the solvent and @S06149@ and the temperature) under which it is investigated, and whose nature depends on the technique that is employed. Some typical characteristic potentials are the @H02722@ in @P04716@, the @Q04992@ in chronopotentiometry, the @P04464@ and the @H02720@ in linear-sweep voltammetry, and the @S06133@ in ac @P04716@.