High-order above-threshold dissociation of molecules
Peifen Lu1, Junping Wang2, Hui Li3
1State Key Laboratory of Precision Spectroscopy, East China Normal University, 200062 Shanghai, China; pflu@lps.ecnu.edu.cn fhe@sjtu.edu.cn jwu@phy.ecnu.edu.cn.
Summary
Researchers observed high-order above-threshold dissociation in hydrogen molecules using strong laser fields. This confirms that electrons and nuclei absorb multiple photons simultaneously, a key concept in strong-field molecular physics.
Area of Science:
- Strong-field molecular physics
- Quantum optics
- Chemical physics
Background:
- Above-threshold ionization (ATI) involves electrons absorbing multiple photons.
- Above-threshold dissociation (ATD) proposes similar multi-photon energy deposition in molecular nuclei.
- Observing ATD is experimentally challenging but theoretically predicted.
Purpose of the Study:
- To experimentally observe high-order above-threshold dissociation (ATD) in molecules.
- To provide evidence for simultaneous multi-photon absorption by both electrons and nuclei.
- To investigate the role of electron-nucleus energy transfer in strong laser fields.
Main Methods:
- Utilizing intense laser fields to induce molecular responses.
- Employing tunneling ionization of hydrogen molecules (H2).
- Analyzing inelastic electron-nucleus rescattering dynamics.
Main Results:
- Conclusive experimental observation of high-order above-threshold dissociation (ATD) in H2.
- Demonstration of multi-photon energy transfer from ionized electrons to molecular nuclei.
- Evidence of simultaneous above-threshold ionization (ATI) and ATD.
Conclusions:
- The study confirms the simultaneous occurrence of ATI and ATD in strong laser fields.
- Electron-nucleus energy transfer via rescattering is a key mechanism for ATD.
- These findings are fundamental to understanding strong-field molecular physics.
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