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Efficient Control of Electron Localization and Probability Modulation with Synthesized Two-Color Intense Laser

Sandip Ghosh¹, Gaurav Pandey^1,2, Ashwani K Tiwari¹

¹Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, West Bengal 741246, India.

The Journal of Physical Chemistry. A

|July 26, 2024

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Synthesized two-color laser fields precisely control molecular ion fragmentation. Researchers tuned relative phase and intensity to manage electron localization and probability modulation in HD⁺ and H₂⁺ ions.

Area of Science:

Quantum Dynamics
Molecular Physics
Attosecond Science

Background:

Investigating electron-nuclear dynamics in molecular ions is crucial for understanding light-matter interactions.
Attosecond time-resolved studies offer unprecedented insight into ultrafast processes.

Purpose of the Study:

To perform coupled electron-nuclear dynamical studies on HD⁺ and H₂⁺ molecular ions using intense two-color electric fields.
To analyze fragmentation processes and control electron localization and probability modulation by tuning laser parameters.

Main Methods:

Employed synthesized two-color fields (ω - 2ω and ω - 3ω) in the infrared/mid-infrared regime.
Studied interference of n - (n + i) photon absorption pathways.
Investigated the effect of initial nuclear wave functions (vibrational eigenstates or superpositions).

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Main Results:

Branching ratios of photofragments were controlled by tuning the relative phase and intensity of two-color pulses.
Efficacy of ω - 2ω and ω - 3ω fields was analyzed for probability modulation and electron localization asymmetry.
Comparison with one-color pulses and previous theoretical/experimental findings was performed.

Conclusions:

The study identified key controlling parameters for electron localization and probability modulation in molecular ions.
Demonstrated the potential of synthesized two-color fields for precise control over molecular fragmentation dynamics.