Micro-focused MHz pink beam for time-resolved X-ray emission spectroscopy

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 1015   photons   s − 1 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.

Source: Journal of Synchrotron Radiation - October 17, 2019 Category: Physics Authors: Tu, M.-F. Doumy, G. Al Haddad, A. March, A.M. Southworth, S.H. Assoufid, L. Kumagai, Y. Walko, D.A. DiChiara, A.D. Liu, Z. Shi, B. Young, L. Bostedt, C. Tags: X-ray emission spectroscopy time-resolved pump/probe synchrotron beryllium lenses solution dynamics MHz repetition rate research papers Source Type: research