Excitation-autoionization contribution to single ionization of Sr by electron impact

Borovik, V.; Shafranyosh, І. І.; Borovik, A

doi:10.1088/1402-4896/ab802d

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“…In particular, the excitation cross sections, decay channels, and spectroscopic classification of the 4p 5 nln ′ l ′ n ′′ l ′′ autoionizing states were obtained. The role of these states in single ionization of Sr atoms was considered by determining the absolute value of the 4p 6 excitation-autoionization (EA) cross section [11].…”

Section: Introductionmentioning

confidence: 99%

Electron-impact ionization of the 4p⁶ subshell in strontium

Borovik¹

2022

J. Phys. B: At. Mol. Opt. Phys.

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Electron-impact ionization of the 4p6 subshell in Sr atoms has been studied by observing the excitation dynamics of the electron spectra arising from the Auger decay of the 4p5nln′l′ states. The measurements were carried out in the energy range of incident electrons from the 4p6 ionization threshold at 26.92 eV to 600 eV. At near-threshold impact energies, the effect of post-collision interaction was found for most of the Auger lines. The identiﬁcation of 21 lines observed between 10-14 eV electron energy showed that the 4p6 Auger spectrum of Sr atoms is completely described by the conﬁgurations 4p54d5s, 4p55s2 and 4p54d2. The cross sections for the lowest quartet and doublet states in 4p54d5s and 4p55s2 conﬁgurations have been obtained with the maximum values of (3.5±0.5)×10−18cm2 at 52 eV for the (4p54d5s)4P5/2 state and (3.0±0.5)×10−17cm2 at 112 eV for the (4p55s2)2P3/2 state. Conﬁguration interaction and excitation-autoionization processes determine the energy behavior of the excitation cross sections of doublet states. The lower limit of the total ionization cross section of the 4p6 subshell in Sr has been obtained with the maximum value of (6.2±1.2)×10−17cm2 at 92 eV.

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Section: Introductionmentioning

confidence: 99%