1. Time-resolved RIXS experiment with pulse-by-pulse parallel readout data collection using X-ray free electron laser
- Author
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Lu, H, Gauthier, A, Hepting, M, Tremsin, AS, Reid, AH, Kirchmann, PS, Shen, ZX, Devereaux, TP, Shao, YC, Feng, X, Coslovich, G, Hussain, Z, Dakovski, GL, Chuang, YD, and Lee, WS
- Subjects
Nuclear and Plasma Physics ,Synchrotrons and Accelerators ,Physical Sciences - Abstract
Time-resolved resonant inelastic X-ray scattering (RIXS) is one of the developing techniques enabled by the advent of X-ray free electron laser (FEL). It is important to evaluate how the FEL jitter, which is inherent in the self-amplified spontaneous emission process, influences the RIXS measurement. Here, we use a microchannel plate (MCP) based Timepix soft X-ray detector to conduct a time-resolved RIXS measurement at the Ti L3-edge on a charge-density-wave material TiSe2. The fast parallel Timepix readout and single photon sensitivity enable pulse-by-pulse data acquisition and analysis. Due to the FEL jitter, low detection efficiency of spectrometer, and low quantum yield of RIXS process, we find that less than 2% of the X-ray FEL pulses produce signals, preventing acquiring sufficient data statistics while maintaining temporal and energy resolution in this measurement. These limitations can be mitigated by using future X-ray FELs with high repetition rates, approaching MHz such as the European XFEL in Germany and LCLS-II in the USA, as well as by utilizing advanced detectors, such as the prototype used in this study.
- Published
- 2020