Lithuanian Journal of Physics article / Lietuvos fizikos žurnalo straipsnis

ELECTRON-IMPACT IONIZATION FOR Kr ATOM
Aušra Kynienė, Vyliautas Paberžis, Šarūnas Masys, and Valdas Jonauskas
Institute of Theoretical Physics and Astronomy, Vilnius University, Saulėtekio 3, 10257 Vilnius, Lithuania
Email: ausra.kyniene@tfai.vu.lt

Received 9 November 2024; revised 1 December 2024; accepted 2 December 2024

Electron-impact ionization cross sections for the ground level of the Kr atom are studied using the scaled distorted-wave (DW) approximation. It is demonstrated that the DW cross sections calculated in the potential of the ionizing ion overestimate the experimental data at low and medium energies of the impacting electron. The scaled DW results, that include in calculations the value of the ionization threshold provided by National Institute of Standards and Technology, lead to good agreement with the measurements. A negligible contribution from the indirect process of the ionization to the total ionization cross sections is obtained in the final results. The study demonstrates that the higher ionization stages appear as a result of the ejection of additional electrons from the atomic system by the sequential ionization.
Keywords: atomic data, ionization, krypton

Kr ATOMO JONIZACIJA ELEKTRONŲ SMŪGIAIS
Aušra Kynienė, Vyliautas Paberžis, Šarūnas Masys, Valdas Jonauskas

Vilniaus universiteto Teorinės fizikos ir astronomijos institutas, Vilnius, Lietuva

Darbe nagrinėjami elektronų smūgiais pasiektos jonizacijos skerspjūviai Kr atomo pagrindiniam lygmeniui, naudojant iškraipytųjų bangų (IB) metodą su daugiklio funkcijomis. IB jonizacijos skerspjūviai, apskaičiuoti jonizuojančio jono potenciale, pervertina eksperimentinius duomenis esant žemoms ir vidutinėms elektronų energijoms. IB rezultatai su daugiklio funkcijomis, kai įtraukiama Nacionalinio standartų ir technologijos instituto pateikta jonizacijos slenksčio vertė, gerai sutampa su atliktais matavimais. Galutiniai rezultatai rodo nereikšmingą netiesioginių jonizacijos procesų indėlį į bendrą jonizacijos, pasiektos elektronų smūgiais, skerspjūvį. Atliktas tyrimas atskleidžia, kad aukštesnės jonizacijos būsenos atsiranda dėl papildomų elektronų išmetimo iš atominės sistemos, vykstant papildomai jonizacijai.

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