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RESUME -En couplant la detection Mirage et une modulation de polarisation de la lumihre incidente, une sensihilite correspondant 1 un dizihme de monocouche de Cu sur Pt a 6th obtenue. On discute egalement des effets de gradient de concentration au voisinage de l'electrodt.ABSTRACT -By coupling Mirage detection and polarization modulation of the incident light, a sensitivity corresponding to one tenth of a monolayer of Cu on Pt has been achieved. Concentration gradient effects in the vicinity of the electrode are discussed.

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