Shake-Off Process in Non-Sequential Single-Photon Double Ionization of Closed-Shell Atomic Targets
Amusia and Kheifets in 1984 introduced a Green’s function formalism to describe the effect of many-electron correlation on the ionization spectra of atoms. Here, we exploit this formalism to model the shake-off (SO) process, leading to the non-sequential single-photon two-electron ionization (double...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-09-01
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| Series: | Atoms |
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| Online Access: | https://www.mdpi.com/2218-2004/10/3/89 |
| _version_ | 1797491286056370176 |
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| author | Anatoli S. Kheifets |
| author_facet | Anatoli S. Kheifets |
| author_sort | Anatoli S. Kheifets |
| collection | DOAJ |
| description | Amusia and Kheifets in 1984 introduced a Green’s function formalism to describe the effect of many-electron correlation on the ionization spectra of atoms. Here, we exploit this formalism to model the shake-off (SO) process, leading to the non-sequential single-photon two-electron ionization (double photoionization—DPI) of closed-shell atomic targets. We separate the SO process from another knock-out (KO) mechanism of DPI and show the SO prevalence away from the DPI threshold. We use this kinematic regime to validate our model by making a comparison with more elaborate techniques, such as convergent and time-dependent close coupling. We also use our model to evaluate the attosecond time delay associated with the SO process. Typically, the SO is very fast, taking only a few attoseconds to complete. However, it can take much longer in the DPI of strongly correlated systems, such as the H<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mrow></mrow><mo>−</mo></msup></semantics></math></inline-formula> ion as well as the subvalent shells of the Ar and Xe atoms and Cl<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mrow></mrow><mo>−</mo></msup></semantics></math></inline-formula> ion. |
| first_indexed | 2024-03-10T00:45:17Z |
| format | Article |
| id | doaj.art-96c29d8e335e467681de47628ce8dde0 |
| institution | Directory Open Access Journal |
| issn | 2218-2004 |
| language | English |
| last_indexed | 2024-03-10T00:45:17Z |
| publishDate | 2022-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Atoms |
| spelling | doaj.art-96c29d8e335e467681de47628ce8dde02023-11-23T15:01:30ZengMDPI AGAtoms2218-20042022-09-011038910.3390/atoms10030089Shake-Off Process in Non-Sequential Single-Photon Double Ionization of Closed-Shell Atomic TargetsAnatoli S. Kheifets0Research School of Physics, The Australian National University, Canberra, ACT 2601, AustraliaAmusia and Kheifets in 1984 introduced a Green’s function formalism to describe the effect of many-electron correlation on the ionization spectra of atoms. Here, we exploit this formalism to model the shake-off (SO) process, leading to the non-sequential single-photon two-electron ionization (double photoionization—DPI) of closed-shell atomic targets. We separate the SO process from another knock-out (KO) mechanism of DPI and show the SO prevalence away from the DPI threshold. We use this kinematic regime to validate our model by making a comparison with more elaborate techniques, such as convergent and time-dependent close coupling. We also use our model to evaluate the attosecond time delay associated with the SO process. Typically, the SO is very fast, taking only a few attoseconds to complete. However, it can take much longer in the DPI of strongly correlated systems, such as the H<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mrow></mrow><mo>−</mo></msup></semantics></math></inline-formula> ion as well as the subvalent shells of the Ar and Xe atoms and Cl<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mrow></mrow><mo>−</mo></msup></semantics></math></inline-formula> ion.https://www.mdpi.com/2218-2004/10/3/89atomic photoionizationmany-electron correlationnon-sequential double ionization |
| spellingShingle | Anatoli S. Kheifets Shake-Off Process in Non-Sequential Single-Photon Double Ionization of Closed-Shell Atomic Targets Atoms atomic photoionization many-electron correlation non-sequential double ionization |
| title | Shake-Off Process in Non-Sequential Single-Photon Double Ionization of Closed-Shell Atomic Targets |
| title_full | Shake-Off Process in Non-Sequential Single-Photon Double Ionization of Closed-Shell Atomic Targets |
| title_fullStr | Shake-Off Process in Non-Sequential Single-Photon Double Ionization of Closed-Shell Atomic Targets |
| title_full_unstemmed | Shake-Off Process in Non-Sequential Single-Photon Double Ionization of Closed-Shell Atomic Targets |
| title_short | Shake-Off Process in Non-Sequential Single-Photon Double Ionization of Closed-Shell Atomic Targets |
| title_sort | shake off process in non sequential single photon double ionization of closed shell atomic targets |
| topic | atomic photoionization many-electron correlation non-sequential double ionization |
| url | https://www.mdpi.com/2218-2004/10/3/89 |
| work_keys_str_mv | AT anatoliskheifets shakeoffprocessinnonsequentialsinglephotondoubleionizationofclosedshellatomictargets |