On efficiency of double ionization of a three-electron atom in moderate laser field intensities
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866908425507569664 |
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| author | Efimov, Dmitry |
| author_facet | Efimov, Dmitry |
| contents | We study double ionization in a one-dimensional model of a three-electron atom exposed to strong short laser fields. The corresponding ab initio simulations reveal a characteristic ``knee'' in the ionization yield at lower field intensities than in comparable two-electron systems. To understand the origin of this shift, a quantitative semi-analytic model for double ionization of a three-electron atom has been created. In this model, ionization is treated as a combination of different scenarios and channels. Each channel is simulated with either Quantitative Rescattering Theory (QRS) or two-electron ab initio model. Analysis of the semi-analytical results indicates that the shifted part of the ``knee'' is dominated by a recollision-excitation channel in which the rescattering electron initially escapes the parent atom from an inner orbital. This counterintuitive phenomenon is then discussed and explained. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_22151 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | On efficiency of double ionization of a three-electron atom in moderate laser field intensities Efimov, Dmitry Atomic Physics We study double ionization in a one-dimensional model of a three-electron atom exposed to strong short laser fields. The corresponding ab initio simulations reveal a characteristic ``knee'' in the ionization yield at lower field intensities than in comparable two-electron systems. To understand the origin of this shift, a quantitative semi-analytic model for double ionization of a three-electron atom has been created. In this model, ionization is treated as a combination of different scenarios and channels. Each channel is simulated with either Quantitative Rescattering Theory (QRS) or two-electron ab initio model. Analysis of the semi-analytical results indicates that the shifted part of the ``knee'' is dominated by a recollision-excitation channel in which the rescattering electron initially escapes the parent atom from an inner orbital. This counterintuitive phenomenon is then discussed and explained. |
| title | On efficiency of double ionization of a three-electron atom in moderate laser field intensities |
| topic | Atomic Physics |
| url | https://arxiv.org/abs/2506.22151 |