Attosecond transient absorption of a continuum threshold

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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)
Year published
2020
Metadata
Show full item recordAbstract
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 ...
View more >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.
View less >
View more >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.
View less >
Journal Title
Journal of Physics B: Atomic, Molecular and Optical Physics
Volume
53
Issue
12
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