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| Main Authors: | , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2503.18913 |
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| _version_ | 1866911008390381568 |
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| author | Hell, Sebastian Späthe, Julian Førre, Morten Klas, Robert Rothhardt, Jan Limpert, Jens Paulus, Gerhard G Moshammer, Robert Ott, Christian Fritzsche, Stephan Kübel, Matthias |
| author_facet | Hell, Sebastian Späthe, Julian Førre, Morten Klas, Robert Rothhardt, Jan Limpert, Jens Paulus, Gerhard G Moshammer, Robert Ott, Christian Fritzsche, Stephan Kübel, Matthias |
| contents | We present coincidence measurements of two-photon double-ionization (TPDI) of argon driven by femtosecond pulses tunable around 26.5 eV photon energy, which are obtained from a high-harmonic generation source. The measured photoelectron spectra are interpreted with regard to three TPDI mechanisms. Theoretical predictions are obtained by an approximate model for direct TPDI and atomic structure calculations, which are implemented into a Monte Carlo simulation. The prevailing mechanism involves the excitation and prompt photoionization of an autoionizing resonance in neutral argon. We provide evidence for pronounced electron-electron interaction in this ultrafast ionization process. Furthermore, we show that the dominant TPDI mechanism can be altered by slight tuning of the photon energy. The present work paves the way for scrutinizing and controlling non-linear photoionization in the extreme ultraviolet using table-top sources. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_18913 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Coincidence measurement of two-photon double ionization of argon through an autoionizing resonance Hell, Sebastian Späthe, Julian Førre, Morten Klas, Robert Rothhardt, Jan Limpert, Jens Paulus, Gerhard G Moshammer, Robert Ott, Christian Fritzsche, Stephan Kübel, Matthias Atomic Physics We present coincidence measurements of two-photon double-ionization (TPDI) of argon driven by femtosecond pulses tunable around 26.5 eV photon energy, which are obtained from a high-harmonic generation source. The measured photoelectron spectra are interpreted with regard to three TPDI mechanisms. Theoretical predictions are obtained by an approximate model for direct TPDI and atomic structure calculations, which are implemented into a Monte Carlo simulation. The prevailing mechanism involves the excitation and prompt photoionization of an autoionizing resonance in neutral argon. We provide evidence for pronounced electron-electron interaction in this ultrafast ionization process. Furthermore, we show that the dominant TPDI mechanism can be altered by slight tuning of the photon energy. The present work paves the way for scrutinizing and controlling non-linear photoionization in the extreme ultraviolet using table-top sources. |
| title | Coincidence measurement of two-photon double ionization of argon through an autoionizing resonance |
| topic | Atomic Physics |
| url | https://arxiv.org/abs/2503.18913 |