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Attosecond Photoionization Dynamics: from Molecules over Clusters to the Liquid Phase
Xiaochun Gong1, Inga Jordan2, Martin Huppert3
1State Key laboratory of precision spectroscopy, East China Normal University, 500 Dongchuan Road, Shanghai, China. xcgong@lps.ecnu.edu.cn.
Chimia
|December 9, 2023
Summary
Photoionization dynamics were studied from atoms to liquid water, revealing electron emission delays that change with system size. These attosecond time-scale delays correlate with electron hole delocalization in complex systems.
Area of Science:
- Attosecond science
- Quantum dynamics
- Condensed matter physics
Background:
- Photoionization is fundamental to understanding electron emission.
- Its evolution from isolated particles to condensed phases remains unclear.
- Attosecond time scales are crucial for observing these dynamics.
Purpose of the Study:
- To review advancements in photoionization dynamics from atoms to the liquid phase.
- To investigate the evolution of photoionization delays in molecules, clusters, and liquid water.
- To correlate time delays with electronic wave function delocalization.
Main Methods:
- Electron-ion coincidence spectroscopy
- Cylindrical liquid-microjet techniques
- Monte-Carlo simulations
- Attosecond pump-probe spectroscopy
Main Results:
- First measurements of molecular photoionization delays reveal attosecond electron emission dynamics.
- Delays increase with water cluster size up to 4-5 molecules, then saturate.
- Liquid water shows delays similar to large clusters, dominated by the first two solvation shells.
Conclusions:
- Photoionization delays provide insights into electron hole spatial extension.
- Experimental characterization of electronic wave function delocalization in complex systems is feasible.
- Understanding attosecond dynamics is key to complex system evolution.
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