Many-electron character of two-photon above-threshold ionization of Ar
| Autor: | Petrov, I. D., Lagutin, B. M., Sukhorukov, V. L., Novikovskiy, N. M., Demekhin, Ph. V., Knie, A., Ehresmann, A. |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Phys. Rev. A, (2019), 99, 013408 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevA.99.013408 |
| Popis: | The absolute generalized cross sections and angular distribution parameters of photoelectrons for the two-photon above threshold $3p$-ionization of Ar were calculated in the exciting photon energy range from 15.76 to 36 eV. The correlation function technique developed earlier was extended for the case when an intermediate-state function is of a continuum-type. We show that two-photon ionization of Ar near the $3p^{4}$ threshold to a large extent is determined by the $(3p\dashrightarrow\varepsilon d)^{2}$ two-photon absorption via the giant resonance. This many-electron correlation causes (i) an increase of the photoionization cross sections by more than a factor of 3; (ii) the appearance of resonances in the exciting-photon energy range of the doubly-excited states. The predictions are supported by a good agreement between length and velocity results obtained after taking into account of the higher-order perturbation theory corrections. Comment: 11 pages, 8 figures, 26 bibliography |
| Databáze: | arXiv |
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