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Dipole-phase evolution of laser-dressed autoionizing states in neon

Sean Marshallsay*, Hugo W. van der Hart, and Andrew C. Brown†

  • Centre for Light-Matter Interaction, School of Mathematics and Physics, Queen's University Belfast, Belfast BT7 1NN, United Kingdom

  • *Contact author: smarshallsay01@qub.ac.uk
  • †Contact author: andrew.brown@qub.ac.uk
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Phys. Rev. A 113, 043127 – Published 28 April, 2026

DOI: https://doi.org/10.1103/f8kv-1lqj

Abstract

We present theoretical attosecond transient absorption spectroscopy calculations of neon, focusing on the [He]2s2p63p1P∘ autoionizing state, in an extreme ultraviolet pump, near infrared probe configuration. We find that as the two laser pulses overlap, there is a strong shift in the dipole phase, which we attribute to an effective reduction in the coupling strength between the bound and continuum states as the near infrared pulse makes new pathways accessible. To quantitatively analyze the dipole phase in the presence of perturbed free-induction decay, we demonstrate a method to obtain resonance phase and strength values directly from the dipole spectrum.

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Phys. Rev. A 113, 043127– Published 28 April, 2026
  • Received 20 January 2026
  • Revised 18 March 2026
  • Accepted 7 April 2026
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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