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Channel-resolved above-threshold double ionization of acetylene
Xiaochun Gong1, Qiying Song1, Qinying Ji1
1State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China.
Physical Review Letters
|May 9, 2015
Summary
We studied acetylene
Area of Science:
- Quantum dynamics
- Molecular physics
- Laser-matter interactions
Background:
- Above-threshold double ionization (ATDI) is a complex process in molecular physics.
- Understanding electron correlation in ATDI is crucial for probing molecular dynamics.
Purpose of the Study:
- Investigate channel-resolved ATDI of acetylene using femtosecond laser pulses.
- Distinguish between sequential and nonsequential ionization pathways.
- Reveal photon-induced isomerization in acetylene.
Main Methods:
- Experimental investigation of acetylene ATDI.
- Utilizing a 395 nm ultraviolet femtosecond laser pulse.
- Measuring all ejected electrons and ions in coincidence.
Main Results:
- Observed diagonal lines in the electron-electron joint energy spectrum for nonsequential ATDI, indicating correlated energy sharing.
- Distinct channel-resolved spectra for sequential and nonsequential ATDI were obtained.
- Demonstrated the ability to reveal acetylene-vinylidene isomerization via proton migration.
Conclusions:
- Nonsequential ATDI dynamics provide insights into electron correlation.
- Channel-resolved ATDI spectra serve as a sensitive probe for ultrafast molecular isomerization.
- Proton migration and isomerization can be identified through ATDI spectral features.
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