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  Nonlinear Coherence Effects in Transient-Absorption Ion Spectroscopy with Stochastic Extreme-Ultraviolet Free-Electron Laser Pulses

Ding, T., Rebholz, M., Aufleger, L., Hartmann, M., Meyer, K., Stooß, V., et al. (2019). Nonlinear Coherence Effects in Transient-Absorption Ion Spectroscopy with Stochastic Extreme-Ultraviolet Free-Electron Laser Pulses. Physical Review Letters, 123(10): 103001. doi:10.1103/PhysRevLett.123.103001.

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 Creators:
Ding, Thomas1, Author              
Rebholz, Marc1, Author              
Aufleger, Lennart1, Author              
Hartmann, Maximilian1, Author              
Meyer, Kristina1, Author              
Stooß, Veit1, Author              
Magunia, Alexander1, Author              
Wachs, David1, Author
Birk, Paul1, Author              
Mi, Yonghao1, Author              
Borisova, Gergana Dimitrova1, Author              
da Costa Castanheira, Carina1, Author              
Rupprecht, Patrick1, Author              
Loh , Zhi-Heng2, Author
Attar , Andrew R.3, Author
Gaumnitz , Thomas4, Author
Roling , Sebastian5, Author
Butz , Marco5, Author
Zacharias , Helmut5, Author
Düsterer , Stefan6, Author
Treusch , Rolf6, AuthorCavaletto, Stefano M.7, Author              Ott , Christian1, AuthorPfeifer, Thomas1, Author               more..
Affiliations:
1Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society, ou_2025284              
2Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore, ou_persistent22              
3Department of Chemistry, University of California, Berkeley, California 94720, USA, ou_persistent22              
4Laboratorium für Physikalische Chemie, Eidgenössische Technische Hochschule Zürich, Vladimir-Prelog-Weg 2, 8093 Zürich, Switzerland, ou_persistent22              
5Physikalisches Institut, Westfälische Wilhelms-Universität Münster, Busso-Peus-Straße 10, 48149 Münster, Germany, ou_persistent22              
6Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany, ou_persistent22              
7Division Prof. Dr. Christoph H. Keitel, MPI for Nuclear Physics, Max Planck Society,, ou_904546              

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Free keywords: Physics, Atomic Physics, physics.atom-ph,Quantum Physics, quant-ph
 MPINP: Research group Z. Harman – Division C. H. Keitel
 Abstract: We demonstrate time-resolved nonlinear extreme-ultraviolet absorption spectroscopy on multiply charged ions, here applied to the doubly charged neon ion, driven by a phase-locked sequence of two intense free-electron laser pulses. Absorption signatures of resonance lines due to 2$p$--3$d$ bound--bound transitions between the spin-orbit multiplets $^3$P$_{0,1,2}$ and $^3$D$_{1,2,3}$ of the transiently produced doubly charged Ne$^{2+}$ ion are revealed, with time-dependent spectral changes over a time-delay range of $(2.4\pm0.3)\,\text{fs}$. Furthermore, we observe 10-meV-scale spectral shifts of these resonances owing to the AC Stark effect. We use a time-dependent quantum model to explain the observations by an enhanced coupling of the ionic quantum states with the partially coherent free-electron-laser radiation when the phase-locked pump and probe pulses precisely overlap in time.

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 Dates: 2019-09-04
 Publication Status: Published online
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Title: Physical Review Letters
  Abbreviation : Phys. Rev. Lett.
Source Genre: Journal
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Publ. Info: Woodbury, N.Y. : American Physical Society
Pages: - Volume / Issue: 123 (10) Sequence Number: 103001 Start / End Page: - Identifier: ISSN: 0031-9007
CoNE: https://pure.mpg.de/cone/journals/resource/954925433406_1