In situ Raman and second harmonic generation studies

Surface Raman spectroscopy and second harmonic generation at metal electrodes are valuable, to some extent complementary, in situ spectroscopic tools for the study of the metal—electrolyte interface. Due to insight into the vibronic properties of adsorbed species surface (un)enhanced Raman spectroscopy permits the study of electrochemical processes as adsorption or oxidation. Second harmonic generation has, however, turned out to be an interesting technique for the in situ monitoring of the formation or lifting of surface reconstruction provided this is accompanied by changes in rotational symetries of the surface. As an example, the influence of metal deposition on surface reconstruction is given