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Annual Review of Physical Chemistry

Volume 74, 2023

Ultrafast X-Ray Probes of Elementary Molecular Events

Abstract

Elementary events that determine photochemical outcomes and molecular functionalities happen on the femtosecond and subfemtosecond timescales. Among the most ubiquitous events are the nonadiabatic dynamics taking place at conical intersections. These facilitate ultrafast, nonradiative transitions between electronic states in molecules that can outcompete slower relaxation mechanisms such as fluorescence. The rise of ultrafast X-ray sources, which provide intense light pulses with ever-shorter durations and larger observation bandwidths, has fundamentally revolutionized our spectroscopic capabilities to detect conical intersections. Recent theoretical studies have demonstrated an entirely new signature emerging once a molecule traverses a conical intersection, giving detailed insights into the coupled nuclear and electronic motions that underlie, facilitate, and ultimately determine the ultrafast molecular dynamics. Following a summary of current sources and experiments, we survey these techniques and provide a unified overview of their capabilities. We discuss their potential to dramatically increase our understanding of ultrafast photochemistry.

Keyword(s): conical intersections, free-electron laser, photochemistry, spectroscopy, X-ray
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/content/journals/10.1146/annurev-physchem-062322-051532
2023-04-24
2024-05-04
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/content/journals/10.1146/annurev-physchem-062322-051532
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Ultrafast X-Ray Probes of Elementary Molecular Events
Annual Review of Physical Chemistry 74, 73 (2023); https://doi.org/10.1146/annurev-physchem-062322-051532
/content/journals/10.1146/annurev-physchem-062322-051532
/content/journals/10.1146/annurev-physchem-062322-051532
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