Coincidence measurement of two-photon double ionization of argon through an autoionizing resonance
We present coincidence measurements of two-photon double ionization (TPDI) of argon driven by femtosecond pulses tunable around 26.5eV photon energy, which are obtained from a high-harmonic generation source. The measured photoelectron spectra are interpreted with regard to three TPDI mechanisms. Th...
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| Format: | Article |
| Language: | English |
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American Physical Society
2025-08-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/f63d-4hrh |
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| author | Sebastian Hell Julian Späthe Morten Førre Robert Klas Jan Rothhardt Jens Limpert Robert Moshammer Christian Ott Gerhard G. Paulus Stephan Fritzsche Matthias Kübel |
| author_facet | Sebastian Hell Julian Späthe Morten Førre Robert Klas Jan Rothhardt Jens Limpert Robert Moshammer Christian Ott Gerhard G. Paulus Stephan Fritzsche Matthias Kübel |
| author_sort | Sebastian Hell |
| collection | DOAJ |
| description | We present coincidence measurements of two-photon double ionization (TPDI) of argon driven by femtosecond pulses tunable around 26.5eV 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 nonlinear photoionization in the extreme ultraviolet using table-top sources. |
| format | Article |
| id | doaj-art-cf3aff24d5f34fa682185d4da14ac6d4 |
| institution | Kabale University |
| issn | 2643-1564 |
| language | English |
| publishDate | 2025-08-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj-art-cf3aff24d5f34fa682185d4da14ac6d42025-08-20T03:40:21ZengAmerican Physical SocietyPhysical Review Research2643-15642025-08-0173L03203010.1103/f63d-4hrhCoincidence measurement of two-photon double ionization of argon through an autoionizing resonanceSebastian HellJulian SpätheMorten FørreRobert KlasJan RothhardtJens LimpertRobert MoshammerChristian OttGerhard G. PaulusStephan FritzscheMatthias KübelWe present coincidence measurements of two-photon double ionization (TPDI) of argon driven by femtosecond pulses tunable around 26.5eV 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 nonlinear photoionization in the extreme ultraviolet using table-top sources.http://doi.org/10.1103/f63d-4hrh |
| spellingShingle | Sebastian Hell Julian Späthe Morten Førre Robert Klas Jan Rothhardt Jens Limpert Robert Moshammer Christian Ott Gerhard G. Paulus Stephan Fritzsche Matthias Kübel Coincidence measurement of two-photon double ionization of argon through an autoionizing resonance Physical Review Research |
| title | Coincidence measurement of two-photon double ionization of argon through an autoionizing resonance |
| title_full | Coincidence measurement of two-photon double ionization of argon through an autoionizing resonance |
| title_fullStr | Coincidence measurement of two-photon double ionization of argon through an autoionizing resonance |
| title_full_unstemmed | Coincidence measurement of two-photon double ionization of argon through an autoionizing resonance |
| title_short | Coincidence measurement of two-photon double ionization of argon through an autoionizing resonance |
| title_sort | coincidence measurement of two photon double ionization of argon through an autoionizing resonance |
| url | http://doi.org/10.1103/f63d-4hrh |
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