Spatially and Spectrally Resolved X-ray Fluorescence From a Nitrogen Plasma Channel
ORAL
Abstract
We performed a demonstration experiment using x-ray emission spectroscopy to directly observe the spatial and temporal evolution of excited state populations in photoexcited molecular nitrogen. A novel one dimensional imaging spectrometer in the small quantum systems instrument at the European XFEL spatially and spectrally resolved soft x-ray-induced emission in a dense gas of molecular nitrogen along the x-ray propagation direction. We observed long-lived x-ray induced dynamics by varying the repetition rate of the XFEL to effectively perform an x-ray/x-ray pump/probe experiment. We also used an NIR ultrafast laser to optically excite the nitrogen and the x-ray emission probe to observe population redistribution. The results of this experiment demonstrate high spatial and spectral resolution of this new spectrometer and provides a proof of concept for future laser-based experiments.
*We acknowledge European XFEL in Schenefeld, Germany, for provision of X-ray free-electron laser beamtime at Scientific Instrument SQS (Small Quantum Systems) under proposal number 6818 and would like to thank the staff for their assistance. This work was funded by the Linac Coherent Light Source, SLAC National Accelerator Laboratory, which is supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-76SF00515.
–
Presenters
-
Mathew Britton
- Stanford University
- SLAC National Accelerator Laboratory