Abstract
AbstractThe electrochemically modulated infrared spectroscopy (EMIRS) is a highly sensitive in‐situ technique to obtain vibrational spectra of species adsorbed on metal electrodes. The contribution discusses the influence of several experimental parameters as the electrode potential, the frequency and amplitude of the superposed potential modulation and the pH value of the electrolyte on the spectra of water molecules within the Helmholtz Double Layer at a platinum surface. The spectra contain significant information about conformational changes of water molecules, which are coadsorbed by atomic hydrogen on the platinum surface. The comparison of experimental results to those of theoretical calculations with Lagrange formalism indicates that, modulating the potential of a positively charged electrode, a complex molecule structure is varied at the surface.
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