Circular RABBITT goes under threshold
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arXiv
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| Auteurs principaux: | , , , , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866915823817326592 |
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| author | Serov, Vladislav V. Ji, Jia-Bao Han, Meng Ueda, Kiyoshi Woerner, Hans Jakob Kheifets, Anatoli S. |
| author_facet | Serov, Vladislav V. Ji, Jia-Bao Han, Meng Ueda, Kiyoshi Woerner, Hans Jakob Kheifets, Anatoli S. |
| contents | We introduce circular under-threshold RABBITT (cuRABBITT) as a new interferometric method to probe discrete electronic excitations in atoms with attosecond resolution. By combining circularly polarized attosecond pulses with broadband (``rainbow'') spectral analysis, we directly access two-photon ionization amplitudes and their relative phases. Time-dependent Schrödinger simulations, supported by Green's function theory, reveal strong resonances in helium and argon and a Cooper-like minimum in xenon. These results demonstrate that cuRABBITT provides continuous spectral mapping of bound-state resonances and extends Fano's propensity rule into the under-threshold regime. Our work establishes cuRABBITT as a powerful attosecond metrology technique, opening the way to polarization-resolved studies of resonant dynamics in atoms and molecules. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_07445 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Circular RABBITT goes under threshold Serov, Vladislav V. Ji, Jia-Bao Han, Meng Ueda, Kiyoshi Woerner, Hans Jakob Kheifets, Anatoli S. Atomic Physics We introduce circular under-threshold RABBITT (cuRABBITT) as a new interferometric method to probe discrete electronic excitations in atoms with attosecond resolution. By combining circularly polarized attosecond pulses with broadband (``rainbow'') spectral analysis, we directly access two-photon ionization amplitudes and their relative phases. Time-dependent Schrödinger simulations, supported by Green's function theory, reveal strong resonances in helium and argon and a Cooper-like minimum in xenon. These results demonstrate that cuRABBITT provides continuous spectral mapping of bound-state resonances and extends Fano's propensity rule into the under-threshold regime. Our work establishes cuRABBITT as a powerful attosecond metrology technique, opening the way to polarization-resolved studies of resonant dynamics in atoms and molecules. |
| title | Circular RABBITT goes under threshold |
| topic | Atomic Physics |
| url | https://arxiv.org/abs/2506.07445 |