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Electrochemical Etching and Characterization of Sharp Field Emission Points for Electron Impact Ionization
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Terahertz-field-modified electron dynamics in above-threshold ionization.

A V Mitrofanov, M V Rozhko, E E Serebryannikov

    Optics Letters
    |November 4, 2025
    PubMed
    Summary
    This summary is machine-generated.

    We demonstrate control over electron dynamics in argon using intense terahertz (THz) fields. The terahertz field

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    Area of Science:

    • Quantum dynamics
    • Ultrafast spectroscopy
    • Atomic physics

    Background:

    • Above-threshold ionization (ATI) is a fundamental process in strong-field physics.
    • Controlling electron dynamics with external fields is crucial for ultrafast science.
    • Terahertz (THz) fields offer unique capabilities due to their long wavelengths and tunable electric fields.

    Purpose of the Study:

    • To experimentally demonstrate control of electron dynamics during ATI of argon.
    • To investigate the influence of a single-cycle THz field on ATI spectra.
    • To explore the potential for THz pulse characterization using ATI.

    Main Methods:

    • Experimental setup involving argon gas and synchronized near-infrared and THz pulses.
    • Above-threshold ionization (ATI) measurements.
    • Analysis using improved strong-field approximation and classical electron trajectory simulations.

    Main Results:

    • The vector potential of the THz field significantly influences ATI photoelectron energy spectra.
    • Maximum photoelectron energy, ATI peak separation, and total electron yield are tunable by the THz field.
    • Time delay between ionizing and THz pulses critically affects electron dynamics.

    Conclusions:

    • Precise control over electron dynamics in ATI is achievable with moderately strong single-cycle THz fields.
    • ATI spectra serve as a sensitive probe for characterizing THz pulse properties.
    • This work opens avenues for advanced THz field control and metrology.