Specific features of the three-electron KL2, 32 ionization of silicon atoms upon near-threshold photoabsorption |
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Authors: | N. A. Borovoĭ |
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Affiliation: | (1) Shevchenko Kiev National University, Kiev, 03680, Ukraine |
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Abstract: | The shape and relative intensity of the group of the Kα5–8 satellites (radiative transitions KL 2, 3 2 )-L 2, 3 3 of Si atoms are experimentally studied upon photoabsorption near and far from the KL 2, 3 2 ionization threshold. The satellites were excited near the ionization threshold by lines of the characteristic L spectrum and bremsstrahlung radiation from Nb and Mo anodes and far from the threshold by the L spectrum and bremsstrahlung radiation from an Ag anode and by monochromatized Kα1, 2 radiation from a Ti anode. It is established that the probability P(L 2, 3 2 ) of formation of two additional 2p vacancies during KL 2, 3 2 photoabsorption of Si atoms near the energy threshold is by a factor of 1.5 lower than that during photoionization in a more distant energy region beyond the threshold. At the same time, the P(L 2, 3 2 )/P(L 2, 3) ratio remains invariable for the absorbed photons throughout the energy range studied. It is demonstrated that, as the KL 2, 3 2 ionization threshold is approached, an intensity redistribution occurs among the components of the group of the Kα5–8 lines, which reflects a decrease in the excitation cross section ratio σ(4 P)/σ(2 P) of the 4 P and 2 P terms of the KL 2, 3 2 configuration. A conclusion is drawn that the effects of suppression of the generation of P terms of higher multiplicity during the KL 2, 3 and KL 2, 3 2 near-threshold photoionizations are of a common nature. |
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