[2P01-29] Poster session

[2P08] Simultaneous soft X-ray absorption measurements of solid–liquid interfaces and bulk liquids using electron-yield and transmission modes

*Fumitoshi Kumaki^1,2, Satsuki Okutomi¹, Kota Enomoto¹, Hiroshi Kondoh¹, Masanari Nagasaka^3,4 (1. Keio University (Japan), 2. Institute of Materials Structure Science (Japan), 3. Institute of Molecular Sciences (Japan), 4. SOKENDAI (Japan))

A liquid cell that enables simultaneous measurements of bulk liquids in transmission mode and solid-liquid interfaces in electron-yield mode in soft X-ray absorption spectroscopy (XAS) was developed and demonstrated at KEK-PF. The liquid cell consists of a 100-nm-thick Si₃N₄ membrane and a gold-deposited Si₃N₄ membrane sandwiching a liquid layer. We measured O K-edge XAS spectra of the H₂O/Au interface in electron-yield mode by detecting the drain current from the Au surface induced by soft X-ray irradiation, while O K-edge XAS spectra of bulk H₂O were simultaneously obtained in transmission mode by precisely controlling the thickness of the liquid layer. The XAS spectrum of the H₂O/Au interface showed a clear difference in the pre-edge region compared with the bulk H₂O spectrum. Future applications of this liquid cell to catalytic reactions at solid-liquid interfaces will also be discussed.

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