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Attosecond precision in delay measurements using transient absorption spectroscopy.

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    Researchers precisely measured attosecond (as) dynamics using attosecond transient absorption spectroscopy. This new method quantifies attosecond delays with sub-5 attosecond precision, advancing ultrafast science.

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    Area of Science:

    • Quantum dynamics
    • Attosecond science
    • Ultrafast spectroscopy

    Background:

    • Directly accessing attosecond dynamics in the time domain is crucial for understanding ultrafast processes.
    • Previous methods like photoemission and high-harmonic spectroscopy have extracted attosecond delays.
    • Quantifying precisely controlled attosecond delays remains a challenge.

    Purpose of the Study:

    • To present and benchmark a novel approach for quantifying attosecond delays.
    • To demonstrate the precision of attosecond transient absorption spectroscopy (ATAS) in measuring delays.
    • To enable future studies of attosecond delays through resonant excitations.

    Main Methods:

    • Utilizing attosecond transient absorption spectroscopy (ATAS).
    • Employing resonant photoexcitation of three extreme ultraviolet (XUV) transitions.
    • Inducing and quantifying delays via chirp on the attosecond pulse using thin-foil metallic filters.

    Main Results:

    • Successfully quantified deliberately induced delays with a precision of less than 5 attoseconds.
    • Demonstrated the sensitivity of the ATAS method to attosecond delays.
    • Validated the approach for precise measurement of ultrafast temporal dynamics.

    Conclusions:

    • Attosecond transient absorption spectroscopy provides a precise method for quantifying attosecond delays.
    • The developed approach opens new avenues for probing ultrafast dynamics in resonant systems.
    • This work advances the capability to study electron dynamics on the attosecond timescale.