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Journal Article

Attosecond transient absorption of a continuum threshold

MPS-Authors
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Birk,  Paul
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Stooß,  Veit
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Hartmann,  Maximilian
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Borisova,  Gergana Dimitrova
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Blättermann,  Alexander
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Heldt,  Tobias
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Ott,  Christian
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

/persons/resource/persons30892

Pfeifer,  Thomas
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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https://iopscience.iop.org/article/10.1088/1361-6455/ab7c3f/pdf
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Citation

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.


Cite as: https://hdl.handle.net/21.11116/0000-0007-146F-7
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.