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  Attosecond transient absorption of a continuum threshold

Birk, P., Stooß, V., Hartmann, M., Borisova, G. D., Blättermann, A., Heldt, T., et al. (2020). Attosecond transient absorption of a continuum threshold. Journal of Physics B: Atomic, Molecular and Optical Physics, 53: 124002. doi:10.1088/1361-6455/ab7c3f.

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Birk, Paul1, Author           
Stooß, Veit1, Author           
Hartmann, Maximilian1, Author           
Borisova, Gergana Dimitrova1, Author           
Blättermann, Alexander1, Author           
Heldt, Tobias1, Author           
Bartschat , Klaus, Author
Ott, Christian1, Author           
Pfeifer, Thomas1, Author           
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1Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society, ou_2025284              

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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 as a good approximation for the perturbed continuum response.

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 Dates: 2020-05-27
 Publication Status: Published online
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 Identifiers: DOI: 10.1088/1361-6455/ab7c3f
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Title: Journal of Physics B: Atomic, Molecular and Optical Physics
Source Genre: Journal
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Publ. Info: Bristol : IOP Publishing
Pages: - Volume / Issue: 53 Sequence Number: 124002 Start / End Page: - Identifier: ISSN: 0022-3700
ISSN: 1361-6455
CoNE: https://pure.mpg.de/cone/journals/resource/0022-3700