This apparatus delivers stable sub-micrometer jets in vacuum for soft x-ray spectroscopy, indicating enhanced measurement capabilities.
We have developed a vacuum-compatible liquid flat-jet apparatus that delivers stable, sub-micrometer sheets for soft-x-ray spectroscopy. Interchangeable PEEKsil microjets (ϕ 25–100 μm) collide to form a leaf-like jet that runs reproducibly for more than 6 h at ∼0.1 Pa. A stepper-motor-driven high-performance liquid chromatography pump, stop-and-go flow control, and anti-icing skimmer/catcher enable rapid restart without venting the vacuum. Spectral interferometry confirms jet thicknesses of 0.7 μm (ϕ 25 μm) and 1–2 μm for the standard ϕ 50 μm setup. The open design of the apparatus simplifies alignment and supports both transmission and grazing-incidence reflection modes. This apparatus provides a robust, user-friendly platform for ultrafast liquid-phase spectroscopy and surface-sensitive measurements.
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Fujiwara et al. (2025) studied this question.
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