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Updated: Oct 23, 2025

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Published on: July 27, 2018
State selective fragmentation of doubly ionized sulphur dioxide
M Jarraya1,2, M Wallner3, G Nyman4
1Université Gustave Eiffel, COSYS/LISIS, 5 Bd Descartes, 77454, Champs sur Marne, France.
This study reveals state-selective double ionization of sulfur dioxide (SO2) at 40.81 eV. A new mechanism yielding high-energy products was discovered, applicable to various ionization processes.
Area of Science:
- Atomic and Molecular Physics
- Quantum Chemistry
- Chemical Physics
Background:
- Understanding molecular ionization processes is crucial for various fields.
- Selective ionization pathways can simplify complex molecular interactions.
Purpose of the Study:
- To investigate the state selectivity of double ionization in SO2.
- To identify novel mechanisms governing multiple ionization.
Main Methods:
- Multi-electron-ion coincidence measurements.
- High-level theoretical calculations.
- Analysis of ionization products at 40.81 eV.
Main Results:
- Demonstrated state-selective double ionization of SO2.
- Identified a new mechanism producing high-energy products in good yield.
- Observed a mechanism with broad applicability to multiple ionization.
Conclusions:
- The discovered mechanism offers a new perspective on molecular ionization.
- State selectivity in double ionization of SO2 is achievable.
- The findings have implications for understanding and controlling multiple ionization events.
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