Chemical Sciences and Engineering Division, Argonne National Laboratory, USA.
Advanced Photon Source, Argonne National Laboratory, USA.
J Synchrotron Radiat. 2019 Nov 1;26(Pt 6):1956-1966. doi: 10.1107/S1600577519012268. Epub 2019 Oct 18.
The full radiation from the first harmonic of a synchrotron undulator (between 5 and 12 keV) at the Advanced Photon Source is microfocused using a stack of beryllium compound refractive lenses onto a fast-moving liquid jet and overlapped with a high-repetition-rate optical laser. This micro-focused geometry is used to perform efficient nonresonant X-ray emission spectroscopy on transient species using a dispersive spectrometer geometry. The overall usable flux achieved on target is above 10 photons s at 8 keV, enabling photoexcited systems in the liquid phase to be tracked with time resolutions from tens of picoseconds to microseconds, and using the full emission spectrum, including the weak valence-to-core signal that is sensitive to chemically relevant electronic properties.
在高级光源的同步辐射装置的第一谐波（5 到 12keV 之间）的全辐射，使用一组铍化合物的折射透镜聚焦到快速移动的液体射流上，并与高重复率的光学激光重叠。这种微聚焦几何结构用于在瞬态物种上进行高效的非共振 X 射线发射光谱学，使用色散光谱仪几何结构。在目标上实现的总可用通量在 8keV 时超过 10 个光子每秒，从而能够以从数十皮秒到微秒的时间分辨率跟踪液相中的光激发体系，并使用全发射光谱，包括对化学相关电子性质敏感的弱价到核信号。
