Simultaneous measurements of solid-liquid interfaces and bulk liquids using soft X-ray absorption spectroscopy

Area of Science:

• Spectroscopy
• Materials Science
• Physical Chemistry

Background:

• Soft X-ray absorption spectroscopy (XAS) is crucial for analyzing electronic structures.
• Studying solid-liquid interfaces presents unique challenges for spectroscopic analysis.
• Previous methods lacked the capability for simultaneous measurements of interfaces and bulk liquids.

Purpose of the Study:

• To develop and validate simultaneous measurement methods for soft X-ray absorption spectroscopy (XAS) of solid-liquid interfaces and bulk liquids.
• To investigate the O K-edge XAS spectra of H2O/Au interfaces and bulk H2O.
• To establish optimal measurement conditions for solid-liquid interfaces using XAS.

Main Methods:

• Development of a transmission-type liquid cell for soft XAS measurements.
• Utilized a liquid layer sandwiched between Au/Cr/Si3N4 and Si3N4 membranes.
• Employed transmission method for bulk H2O and electron-yield method for H2O/Au interfaces.

Main Results:

• Successfully obtained O K-edge XAS spectra for both bulk H2O and H2O/Au interfaces.
• Differentiated XAS spectra of bulk H2O and H2O/Au interfaces.
• Determined appropriate measurement conditions for solid-liquid interface analysis.

Conclusions:

• The developed methods allow for simultaneous soft XAS measurements of solid-liquid interfaces and bulk liquids.
• The study provides insights into the electronic structure of water at the H2O/Au interface.
• This work facilitates further research on interfacial phenomena using XAS.