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Related Concept Videos

Double Resonance Techniques: Overview01:12

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Updated: Dec 28, 2025

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
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Attosecond pulse generation from $H_2^ + $H2+ ions using a multicolor beam superposition method.

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    Investigating high-order harmonics and attosecond pulses from hydrogen molecular ions reveals that large internuclear distances and spectrally wide laser pulses generate the most intense and shortest pulses.

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    Area of Science:

    • * Quantum mechanics
    • * Molecular physics
    • * Attosecond science

    Background:

    • * High-order harmonic generation (HHG) is a key process for producing ultrashort light pulses.
    • * Attosecond pulse generation from molecular systems is complex due to their structure.
    • * Understanding the influence of molecular geometry on HHG is crucial for controlling light pulses.

    Purpose of the Study:

    • * To investigate the generation of high-order harmonics and attosecond pulses from hydrogen molecular ions.
    • * To explore the effect of varying internuclear distances on the properties of the emitted pulses.
    • * To determine the optimal conditions for generating intense and short attosecond pulses.

    Main Methods:

    • * Numerical simulations of hydrogen molecular ions interacting with intense laser fields.
    • * Analysis of high-order harmonic spectra and attosecond pulse characteristics.
    • * Variation of internuclear distances and spectral bandwidth of the driving laser pulse.

    Main Results:

    • * The intensity and duration of attosecond pulses are strongly dependent on the internuclear distance.
    • * Hydrogen molecular ions with larger internuclear distances produce more intense attosecond pulses.
    • * Spectrally wide laser pulses (bandwidth > 0.03 a.u.) are essential for generating the shortest pulses.

    Conclusions:

    • * Large internuclear distances in hydrogen molecular ions are favorable for generating intense attosecond pulses.
    • * The spectral width of the driving laser pulse plays a critical role in attosecond pulse duration.
    • * This research provides insights into controlling attosecond pulse generation from molecules.