Abstract
A laser electroreflectance technique was assembled for in situ studies of electrochemical processes occurring in thin and transparent layers, involving optical transitions, on a non transparent electrode. This technique is adequate to follow variations of the population of polarons, bipolarons, π or π ∗ levels in conducting polymers during oxidation or reduction processes. It competes with ESR to follo the population of polarons. The population of polarons in polypyrrole films during oxidation or reduction in acetonitrile and the evolution of the interband π→π ∗ absorptions in poly-3-methylthiophene films are presented using a 514 nm argon laser beam.
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