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Interference Structures in the High-Order Above-Threshold Ionization Spectra of Polyatomic Molecules in a Bicircular
Elvedin Hasović1, Azra Gazibegović-Busuladžić1, Mustafa Busuladžić2
1Faculty of Science, University of Sarajevo, 71000 Sarajevo, Bosnia and Herzegovina.
Molecules (Basel, Switzerland)
|July 30, 2025
Summary
High-order above-threshold ionization (HATI) in BF3 molecules reveals interference patterns. Destructive interference of electron wave packets from multiple atoms causes spectral minima, offering insights into molecular structure and laser interactions.
Area of Science:
- Quantum mechanics
- Atomic and molecular physics
- Strong-field physics
Background:
- High-order above-threshold ionization (HATI) is a complex quantum phenomenon.
- Understanding molecular ionization dynamics is crucial for various applications.
- Bicircular laser fields offer unique control over ionization processes.
Purpose of the Study:
- To investigate the HATI process in a small polyatomic molecule (BF3) under a bicircular laser field.
- To analyze the influence of molecular symmetry and atomic contributions on HATI spectra.
- To identify and characterize interference phenomena in HATI spectra.
Main Methods:
- Utilizing an improved molecular strong-field approximation.
- Calculating electron energy-angle-resolved and momentum spectra.
- Analyzing spectra for contributions from individual atoms and molecular symmetry.
Main Results:
- HATI spectra are significantly influenced by molecular properties and laser parameters.
- Pronounced interference minima are observed in the HATI spectra.
- These minima are attributed to the destructive interference of rescattered electron wave packets.
Conclusions:
- The study elucidates the role of multi-center interference in shaping HATI spectra.
- Conditions for two-, three-, and four-center interference are determined.
- Findings provide insights into electron dynamics and molecular structure in strong laser fields.
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