Attenuated total reflectance surface-enhanced infrared absorption spectroscopy (ATR-SEIRAS) provides in situ surface-sensitive IR spectra of molecules at the electrodesolution interface. A Au thin film electrode is deposited on the reflecting plane of the ATR optic. Excitation of surface plasmon modes in the film provides up to 10-fold electric field enhancement at the interface, enhancing IR crosssections of adsorbed species up to 100-fold. Controlling the applied potential on the film allows vibrational characterisation of potential-induced changes. Such studies reveal fundamental details of electrochemical processes and inform the development of next generation energy and sensing solutions.
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