Enhanced One-Color-Two-Photon Resonant Ionization in Highly Charged Ions by Fine-Structure Effects
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arXiv
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| Natura: | Preprint |
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2025
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| author | Togawa, Moto Lyu, Chunhai Shah, Chintan Botz, Marc Goes, Joschka Danisch, Jonas Maxton, Marleen Köbnick, Kai Grilo, Filipe Amaro, Pedro Kubicek, Katharina Sekkal, Mohammed Mohamed, Awad Boll, Rebecca De Fanis, Alberto Dold, Simon Mazza, Tommaso Montano, Jacobo Rennhack, Nils Senfftleben, Björn Usenko, Sergey Harman, Zoltan Keitel, Christoph H. Leutenegger, Maurice Meyer, Michael Pfeifer, Thomas López-Urrutia, José R. Crespo Baumann, Thomas M. |
| author_facet | Togawa, Moto Lyu, Chunhai Shah, Chintan Botz, Marc Goes, Joschka Danisch, Jonas Maxton, Marleen Köbnick, Kai Grilo, Filipe Amaro, Pedro Kubicek, Katharina Sekkal, Mohammed Mohamed, Awad Boll, Rebecca De Fanis, Alberto Dold, Simon Mazza, Tommaso Montano, Jacobo Rennhack, Nils Senfftleben, Björn Usenko, Sergey Harman, Zoltan Keitel, Christoph H. Leutenegger, Maurice Meyer, Michael Pfeifer, Thomas López-Urrutia, José R. Crespo Baumann, Thomas M. |
| contents | Ultraintense pulses from X-ray free-electron lasers can drive, within femtoseconds, multiple processes in the inner shells of atoms and molecules in all phases of matter. The ensuing complex ionization pathways of outer-shell electrons from the neutral to the final highly charged states make a comparison with theory enormously difficult. We resolve these pathways by preparing highly charged ions in an electron beam ion trap before exposing them to the pulsed radiation. This reveals how relativistic fine-structure effects shift electronic energies, largely compensate the core-screening potential, and enable the consecutive, resonant absorption of two quasi-monochromatic X-ray photons that would generally be unfeasible. This doubly-resonant channel enhances the efficiency of two-photon ionization by more than two orders of magnitude, dominating in this regime the nonlinear interaction of light and matter with possible application for future precision X-ray metrology. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_05148 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Enhanced One-Color-Two-Photon Resonant Ionization in Highly Charged Ions by Fine-Structure Effects Togawa, Moto Lyu, Chunhai Shah, Chintan Botz, Marc Goes, Joschka Danisch, Jonas Maxton, Marleen Köbnick, Kai Grilo, Filipe Amaro, Pedro Kubicek, Katharina Sekkal, Mohammed Mohamed, Awad Boll, Rebecca De Fanis, Alberto Dold, Simon Mazza, Tommaso Montano, Jacobo Rennhack, Nils Senfftleben, Björn Usenko, Sergey Harman, Zoltan Keitel, Christoph H. Leutenegger, Maurice Meyer, Michael Pfeifer, Thomas López-Urrutia, José R. Crespo Baumann, Thomas M. Atomic Physics Ultraintense pulses from X-ray free-electron lasers can drive, within femtoseconds, multiple processes in the inner shells of atoms and molecules in all phases of matter. The ensuing complex ionization pathways of outer-shell electrons from the neutral to the final highly charged states make a comparison with theory enormously difficult. We resolve these pathways by preparing highly charged ions in an electron beam ion trap before exposing them to the pulsed radiation. This reveals how relativistic fine-structure effects shift electronic energies, largely compensate the core-screening potential, and enable the consecutive, resonant absorption of two quasi-monochromatic X-ray photons that would generally be unfeasible. This doubly-resonant channel enhances the efficiency of two-photon ionization by more than two orders of magnitude, dominating in this regime the nonlinear interaction of light and matter with possible application for future precision X-ray metrology. |
| title | Enhanced One-Color-Two-Photon Resonant Ionization in Highly Charged Ions by Fine-Structure Effects |
| topic | Atomic Physics |
| url | https://arxiv.org/abs/2511.05148 |