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  • Attosecond transient absorption of a continuum threshold

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    Bartschat432683-Published.pdf (1.377Mb)
    Author(s)
    Birk, Paul
    Stooss, Veit
    Hartmann, Maximilian
    Borisova, Gergana D
    Blaettermann, Alexander
    Heldt, Tobias
    Bartschat, Klaus
    Ott, Christian
    Pfeifer, Thomas
    Griffith University Author(s)
    Bartschat, Klaus
    Year published
    2020
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    Abstract
    The laser-field-modified dipole response of the first ionization threshold of helium is studied by means of attosecond transient absorption spectroscopy. We resolve light-induced time-dependent structures in the photoabsorption spectrum both below and above the ionization threshold. By comparing the measured results to a quantum-dynamical model, we isolate the contributions of the unbound electron to these structures. They originate from light-induced couplings of near-threshold bound and continuum states and light-induced energy shifts of the free electron. The ponderomotive energy, at low laser intensities, is identified ...
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    The laser-field-modified dipole response of the first ionization threshold of helium is studied by means of attosecond transient absorption spectroscopy. We resolve light-induced time-dependent structures in the photoabsorption spectrum both below and above the ionization threshold. By comparing the measured results to a quantum-dynamical model, we isolate the contributions of the unbound electron to these structures. They originate from light-induced couplings of near-threshold bound and continuum states and light-induced energy shifts of the free electron. The ponderomotive energy, at low laser intensities, is identified as a good approximation for the perturbed continuum response.
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    Journal Title
    Journal of Physics B: Atomic, Molecular and Optical Physics
    Volume
    53
    Issue
    12
    DOI
    https://doi.org/10.1088/1361-6455/ab7c3f
    Copyright Statement
    © 2020 The Author 1 (s). Published by IOP Publishing Ltd. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
    Subject
    Atomic, Molecular, Nuclear, Particle and Plasma Physics
    Optical Physics
    Theoretical and Computational Chemistry
    Science & Technology
    Physical Sciences
    Optics
    Physics, Atomic, Molecular & Chemical
    Publication URI
    http://hdl.handle.net/10072/397673
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    • Journal articles

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