DOE OSTI · 2503994
Soft X‐Ray Absorption Spectroscopy With a Flat Liquid Jet in Vacuum Using a Table‐Top Laser‐Induced Plasma Source
Abstract
ABSTRACT In this work, we demonstrate the integration of a flat liquid jet sample delivery system into a compact soft x‐ray absorption spectrometer using a table‐top laser‐induced plasma source. A high‐speed flat liquid sheet is formed by the collision of two cylindrical jets. This micrometer‐thin lamella can ideally be utilized for transmission‐mode soft x‐ray absorption spectroscopy using krypton plasma emission. Detailed analysis of the jet's thickness profile is achieved applying Lambert–Beer's law. Measurements on water, focusing on the oxygen K‐edge, reveal a lamella thickness profile ranging from 500 nm to 1 μm over a length of 3.8 mm. Additionally, we have investigated aqueous solutions of iron salts, capturing near edge x‐ray absorption fine structure spectra over a broad spectral range from the nitrogen K‐edge to the iron L‐edge. Focused analysis on iron species in aqueous solutions enabled us to distinguish quantitatively between the oxidation states of Fe 2+ and Fe 3+ at the iron L‐edge. Our results are compared with measurements obtained under similar conditions at a synchrotron.
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Holburg, Jonathan [Department Optics/Short Wavelengths Institut für Nanophotonik Göttingen e.V. Göttingen Germany] (ORCID:0000000176599679), Figul, Stephan [Advanced Microfluidic Systems GmbH Göttingen Germany], Charvat, Ales [Institute of Chemical Technology, University Leipzig Leipzig Germany], Bluhm, Hendrik [Department of Inorganic Chemistry Fritz Haber Institute of the Max Planck Society Berlin Germany], Abel, Bernd [Institute of Chemical Technology, University Leipzig Leipzig Germany], Marowsky, Gerd [Advanced Microfluidic Systems GmbH Göttingen Germany], Mai, Dong‐Du [Department Optics/Short Wavelengths Institut für Nanophotonik Göttingen e.V. Göttingen Germany], Mann, Klaus [Department Optics/Short Wavelengths Institut für Nanophotonik Göttingen e.V. Göttingen Germany]. 2025-01-19. Soft X‐Ray Absorption Spectroscopy With a Flat Liquid Jet in Vacuum Using a Table‐Top Laser‐Induced Plasma Source. https://doi.org/10.1002/xrs.3474
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