期刊
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
卷 54, 期 14, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1361-6455/abcdf1
关键词
x-ray photoelectron spectroscopy; free-electron laser; ghost imaging; AMO physics
资金
- US Department of Energy [DE-AC02-76SF00515, DE-AC02-06CH11357]
- DOE-BES Accelerator and detector research program [100317]
- DOE-BES, Chemical Sciences, Geosciences, and Biosciences Division
- Department of Energy, Laboratory Directed Research and Development program at SLAC National Accelerator Laboratory [DE-AC02-76SF00515]
- U.S. DOE-BES, Division of Chemical Sciences, Geosciences, and Biosciences through Argonne National Laboratory
- U.S. Department of Energy (DOE), Office of Science, Office of Basic Energy Sciences (BES) [DE-AC02-76SF00515]
X-ray photoelectron spectroscopy (XPS) measures the binding energy of core-level electrons, providing information on the local chemical environment in a molecular system. The technique's resolution is often limited by the bandwidth of the ionising x-ray pulse, problematic for time-resolved XPS. A novel correlation analysis method is presented in this work, exploiting the correlation between x-ray and photoelectron spectra to improve resolution in XPS measurements.
X-ray photoelectron spectroscopy (XPS) measures the binding energy of core-level electrons, which are well-localised to specific atomic sites in a molecular system, providing valuable information on the local chemical environment. The technique relies on measuring the photoelectron spectrum upon x-ray photoionisation, and the resolution is often limited by the bandwidth of the ionising x-ray pulse. This is particularly problematic for time-resolved XPS, where the desired time resolution enforces a fundamental lower limit on the bandwidth of the x-ray source. In this work, we report a novel correlation analysis which exploits the correlation between the x-ray and photoelectron spectra to improve the resolution of XPS measurements. We show that with this correlation-based spectral-domain ghost imaging method we can achieve sub-bandwidth resolution in XPS measurements. This analysis method enables XPS for sources with large bandwidth or spectral jitter, previously considered unfeasible for XPS measurements.
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