Wave-packet manipulation of He Rydberg states by a seeded free-electron laser

We report a two-dimensional pump-control-probe spectroscopic study of the dynamics of singly excited He Rydberg-state wave packets with a seeded extreme ultraviolet (XUV) free-electron laser (FEL) source. A pair of coherent XUV pulses, defined by their coarse time separation and relative phase, created and manipulated the wave packets. The He atoms were postionized by infrared (IR) pulses, and the ion yield was measured as a function of XUV phase and IR arrival time. We tagged and sorted the relative phase of the XUV pulse pair on a single-shot basis by fitting each FEL spectrum with a suitable function that accounts for nonidealities of the XUV pulse pairs, associated with the seeding process; more generally, the fit returns the time-dependent electric field of the FEL spectra. The experimental two-dimensional maps of ion yields, measured as a function of IR (probe) delay and of XUV (pump-control) phase, were compared with the solution of the first-order time-dependent Schrödinger equation for this field. Despite the fact that the experimental conditions imply strong excitation, beyond the approximations of first-order perturbation theory, the simulated map satisfactorily reproduces the experimental one for temporally well-separated pulses. We show that by selecting data at appropriate values of pump-control phase, we enhance or suppress the amplitude of chosen wave-packet components consisting of two or more Rydberg states. When the temporal overlap of the pulse pair cannot be neglected, the phase reconstruction is underdetermined, and we provide a simplified comparison between data and simulations. Published by the American Physical Society 2024

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Publication Details

Journal
Physical Review Research
Published
2024-12-27
DOI
https://doi.org/10.1103/physrevresearch.6.043323
Citations
1
Primary Topic
Laser-Matter Interactions and Applications
Type
article
Field-Weighted Citation Impact
0.34

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article

Wave-packet manipulation of He Rydberg states by a seeded free-electron laser

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Wave-packet manipulation of He Rydberg states by a seeded free-electron laser

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article en
1 citations

Abstract

We report a two-dimensional pump-control-probe spectroscopic study of the dynamics of singly excited He Rydberg-state wave packets with a seeded extreme ultraviolet (XUV) free-electron laser (FEL) source. A pair of coherent XUV pulses, defined by their coarse time separation and relative phase, created and manipulated the wave packets. The He atoms were postionized by infrared (IR) pulses, and the ion yield was measured as a function of XUV phase and IR arrival time. We tagged and sorted the relative phase of the XUV pulse pair on a single-shot basis by fitting each FEL spectrum with a suitable function that accounts for nonidealities of the XUV pulse pairs, associated with the seeding process; more generally, the fit returns the time-dependent electric field of the FEL spectra. The experimental two-dimensional maps of ion yields, measured as a function of IR (probe) delay and of XUV (pump-control) phase, were compared with the solution of the first-order time-dependent Schrödinger equation for this field. Despite the fact that the experimental conditions imply strong excitation, beyond the approximations of first-order perturbation theory, the simulated map satisfactorily reproduces the experimental one for temporally well-separated pulses. We show that by selecting data at appropriate values of pump-control phase, we enhance or suppress the amplitude of chosen wave-packet components consisting of two or more Rydberg states. When the temporal overlap of the pulse pair cannot be neglected, the phase reconstruction is underdetermined, and we provide a simplified comparison between data and simulations. Published by the American Physical Society 2024

Physical Review ResearchVol. 6(4)
Argonne National Laboratory (US), TU Wien (AT), University of Fribourg (CH), Lund University (SE), University of Nova Gorica (SI), Tohoku University (JP), AREA Science Park (IT), Elettra-Sincrotrone Trieste S.C.p.A. (IT), ELI-HU Research and Development Non-Profit (HU), Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati (IT), Swinburne University of Technology (AU), Nagoya University (JP)
U.S. Department of Energy, European Commission, Deutsche Forschungsgemeinschaft, Stiftelsen för Strategisk Forskning, Crafoordska Stiftelsen, Knut och Alice Wallenbergs Stiftelse, Vetenskapsrådet, Kungliga Fysiografiska Sällskapet i Lund, Horizon 2020, European Regional Development Fund, Basic Energy Sciences, Chemical Sciences, Geosciences, and Biosciences Division
Openalex Percentile: Top 37%
Laser-Matter Interactions and Applications
0.34
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