Figure 1: (a) Schematic illustration of our method for obtaining simultaneous XAS measurements of an H2O/Au interface (using the electron-yield method) and of bulk H2O (using the transmission method). (b) The O K-edge XAS spectra of bulk H2O and the H2O/Au interface.
(Credit: Masanari Nagasaka Restrictions: CC BY)
We have developed a method for making simultaneous soft X-ray absorption spectroscopy (XAS) measurements of solid–liquid interfaces and bulk liquids. By controlling the thickness of the liquid layer, we obtained the O K-edge XAS spectrum of bulk H2O from a liquid H2O layer on a thin Au film using the transmission method, and we used the electron-yield method to obtain the XAS spectrum of the H2O/Au interface by measuring the drain currents from the Au surface following soft X-ray absorption. This method for obtaining simultaneous XAS measurements of solid–liquid interfaces and bulk liquids can be utilized to investigate the mechanisms of a variety of catalytic, electrochemical, and biological reactions involving solid–liquid interfaces.
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