David J Hoffman, Douglas Garratt, Matthew Bain, Christina Y Hampton, Benjamin I Poulter, Jyoti Joshi, Giacomo Coslovich, Frank P O'Dowd, Daniel P DePonte, Alexander H Reid, Lingjia Shen, Daniel Jost, Mina R Bionta, Joshua J Turner, Ming-Fu Lin, Philip Heimann, Stefan P Moeller, Jake D Koralek, Tyler Johnson, K Ninh, Raybel Almeida, Adam Berges, Stephanie Fung, Shuai Li, Eetu Pelimanni, Amke Nimmrich, Munira Khalil, Linda Young, Thomas J A Wolf, Kristjan Kunnus, Georgi L Dakovski
The chemRIXS instrument at the Linac Coherent Light Source (LCLS) offers new opportunities for studying solution-phase systems with time-resolved soft x-ray spectroscopic methods such as resonant inelastic x-ray scattering (RIXS) using the recently commissioned high-repetition-rate LCLS-II x-ray free-electron laser. The orders-of-magnitude x-ray flux improvement provided by the superconducting accelerator, combined with corresponding advances in the optical laser system and the liquid-jet recirculation system, enables studies on dilute systems with high signal-to-noise compared to what was possible with the LCLS-I copper accelerator. These capabilities open up time-resolved x-ray absorption spectroscopy and RIXS to entirely new classes of samples, as well as enable the development of new soft x-ray spectroscopic methods on liquid samples. An overview of the beamline components and the first LCLS-II commissioning results is presented.