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Attosecond Time Delay in Photoionization of Noble-Gas and Halogen Atoms

Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Straße 38, D-01187 Dresden, Germany
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Appl. Sci. 2018, 8(3), 322; https://doi.org/10.3390/app8030322
Received: 5 February 2018 / Revised: 18 February 2018 / Accepted: 20 February 2018 / Published: 26 February 2018
(This article belongs to the Special Issue Extreme Time Scale Photonics)
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Abstract

Ultrafast processes are now accessible on the attosecond time scale due to the availability of ultrashort XUV laser pulses. Noble-gas and halogen atoms remain important targets due to their giant dipole resonance and Cooper minimum. Here, we calculate photoionization cross section, asymmetry parameter and Wigner time delay using the time-dependent local-density approximation (TDLDA), which includes the electron correlation effects. Our results are consistent with experimental data and other theoretical calculations. The asymmetry parameter provides an extra layer of access to the phase information of the photoionization processes. We find that halogen atoms bear a strong resemblance on cross section, asymmetry parameter and time delay to their noble-gas neighbors. Our predicted time delay should provide a guidance for future experiments on those atoms and related molecules. View Full-Text
Keywords: attosecond time delay; giant dipole resonance; Cooper minimum; asymmetry parameter; noble-gas atoms; halogen atoms attosecond time delay; giant dipole resonance; Cooper minimum; asymmetry parameter; noble-gas atoms; halogen atoms
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Pi, L.-W.; Landsman, A.S. Attosecond Time Delay in Photoionization of Noble-Gas and Halogen Atoms. Appl. Sci. 2018, 8, 322.

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