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Updated: Jan 18, 2026

Microfluidic Chips for In Situ Crystal X-ray Diffraction and In Situ Dynamic Light Scattering for Serial Crystallography
Published on: April 24, 2018
Vacuum-compatible sub-micrometer liquid flat-jet apparatus for soft x-ray spectroscopy
Takashige Fujiwara1, Katsumi Midorikawa1
1Attosecond Science Research Team, RIKEN Center for Advanced Photonics, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
Abstract:
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.

