Journal
JOURNAL OF PHYSICAL CHEMISTRY A
Volume 125, Issue 20, Pages 4276-4293Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpca.0c11267
Keywords
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Funding
- Leverhulme Trust [RPG-2016-103]
- Engineering and Physical Sciences Research Council (EPSRC) [EP/S022058/1, EP/R021503/1, EP/R51309X/1]
- EPSRC [EP/R51309X/1]
- Newcastle University (Newcastle-upon-Tyne, U.K.) [EP/R51309X/1]
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The development of high-brilliance light sources and X-ray spectrometers, along with advances in X-ray absorption and emission spectroscopies, have had far-reaching effects across the natural sciences. The challenge of accurately and cost-effectively analyzing data from new experiments highlights the need for detailed theoretical calculations, with significant progress in core-hole spectroscopy theory.
The development of high-brilliance third- and fourth-generation light sources such as synchrotrons and X-ray free-electron lasers (XFELs), the emergence of laboratory-based X-ray spectrometers, and instrumental and methodological advances in X-ray absorption (XAS) and (non)resonant emission (XES and RXES/RIXS) spectroscopies have had far-reaching effects across the natural sciences. However, new kinds of experiments, and their ever-higher resolution and data acquisition rates, have brought acutely into focus the challenge of accurately, quickly, and cost-effectively analyzing the data; a far-from-trivial task that demands detailed theoretical calculations that are capable of capturing satisfactorily the underlying physics. The past decade has seen significant advances in the theory of core-hole spectroscopies for this purpose, driven by all of the developments above and-crucially-a surge in demand. In this Perspective, we discuss the challenges of calculating core-excited states and spectra, and state-of-the-art developments in electronic structure theory, dynamics, and data-driven/machine-led approaches toward their better description.
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