Two-photon sweeping out of the K-shell of a heavy atomic ion
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arXiv
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2025
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| author | Hopersky, A. N. Nadolinsky, A. M. Novikov, S. A. Koneev, R. V. |
| author_facet | Hopersky, A. N. Nadolinsky, A. M. Novikov, S. A. Koneev, R. V. |
| contents | Within the framework of the second-order non-relativistic quantum perturbation theory, the methods of the theory of irreducible tensor operators, and nonorthogonal orbitals, the absolute values and shape of the generalized cross-sections of the two-photon double ionization (sweeping) of the K-shell of a heavy neon-like ion of an iron atom were predicted. The complete wave functions of the ground state of the ion and the states of its ionization are obtained in the single-configuration Hartree-Fock approximation. The effects of radial relaxation of ionization states in the field of one and two vacancies in the K-shell are taken into account. The matrix element of the operator of the radiation transition between continuum-spectrum states is taken into account by introducing a correlation function. It was established that the generalized cross-section of the two-photon sweeping of the K-shell at high (greater than or equal to 15.8 keV) energies of absorbed X-ray photons is several orders of magnitude greater than the generalized cross-section of the two-photon single ionization of the K-shell. This result qualitatively reproduces the work of Novikov S.A. and Hopersky A.N. (J. Phys. B 2002. V. 35. P. L339), stimulates future research, in particular, the effects of cascade "evaporation" of electron shells of an atom (atomic ion) when filling an empty K-shell and can be tested in X-ray free-electron laser experiments with high peak radiation brightness and ultrashort photon pulse duration. The scheme of the proposed experiment with two linearly polarized X-ray photons is presented. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2512_22896 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Two-photon sweeping out of the K-shell of a heavy atomic ion Hopersky, A. N. Nadolinsky, A. M. Novikov, S. A. Koneev, R. V. Atomic Physics 00A81 Within the framework of the second-order non-relativistic quantum perturbation theory, the methods of the theory of irreducible tensor operators, and nonorthogonal orbitals, the absolute values and shape of the generalized cross-sections of the two-photon double ionization (sweeping) of the K-shell of a heavy neon-like ion of an iron atom were predicted. The complete wave functions of the ground state of the ion and the states of its ionization are obtained in the single-configuration Hartree-Fock approximation. The effects of radial relaxation of ionization states in the field of one and two vacancies in the K-shell are taken into account. The matrix element of the operator of the radiation transition between continuum-spectrum states is taken into account by introducing a correlation function. It was established that the generalized cross-section of the two-photon sweeping of the K-shell at high (greater than or equal to 15.8 keV) energies of absorbed X-ray photons is several orders of magnitude greater than the generalized cross-section of the two-photon single ionization of the K-shell. This result qualitatively reproduces the work of Novikov S.A. and Hopersky A.N. (J. Phys. B 2002. V. 35. P. L339), stimulates future research, in particular, the effects of cascade "evaporation" of electron shells of an atom (atomic ion) when filling an empty K-shell and can be tested in X-ray free-electron laser experiments with high peak radiation brightness and ultrashort photon pulse duration. The scheme of the proposed experiment with two linearly polarized X-ray photons is presented. |
| title | Two-photon sweeping out of the K-shell of a heavy atomic ion |
| topic | Atomic Physics 00A81 |
| url | https://arxiv.org/abs/2512.22896 |