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Theoretical scheme for simultaneously observing forward-backward photoelectron holography.

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    Investigating helium ions (He+) driven by lasers reveals two distinct photoelectron holography patterns. This study identifies forward and backward rescattering holography, offering insights into electron behavior during laser-matter interactions.

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    Area of Science:

    • Atomic, Molecular, and Optical Physics
    • Quantum Mechanics
    • Laser-Matter Interactions

    Background:

    • Understanding photoelectron angular distributions is crucial for probing electron dynamics.
    • Few-cycle lasers enable complex electron wave packet manipulation.
    • Helium ions (He+) provide a fundamental system for studying ionization processes.

    Purpose of the Study:

    • To numerically investigate the photoelectron angular momentum distribution of He+ driven by few-cycle lasers.
    • To identify and characterize dominant interference patterns in photoelectron emission.
    • To distinguish between different types of photoelectron holography and intracycle interference.

    Main Methods:

    • Solving the 3D time-dependent Schrödinger equation for He+ under laser driving.
    • Numerical simulation of photoelectron emission and angular distribution.
    • Analysis using a semiclassical model to interpret interference patterns.

    Main Results:

    • Observation of two dominant interference patterns in a single laser shot.
    • Identification of these patterns as forward and backward rescattering holography.
    • Forward holography arises from direct and rescattered electrons ionized in the same quarter-cycle.
    • Backward holography results from electrons ionized in different quarter-cycles (first and third).

    Conclusions:

    • The study successfully identifies and differentiates two types of photoelectron holography in He+.
    • A method is proposed to distinguish backward rescattering holography from intracycle interference.
    • These findings advance the understanding of electron dynamics and interference phenomena in strong laser fields.