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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 Fe²⁺ and Fe³⁺ at the iron L-edge. Our results are compared with measurements obtained under similar conditions at a synchrotron.