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Atomic alignment of 73Ta, 74W, and 79Au after 𝐿3 subshell ionization by 10–100-keV electron impact
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The alignment parameter A20 of 73Ta, 74W, and 79Au ions after L3 subshell ionization by electron impact has been determined experimentally and theoretically in the wide energy range (1.02-10.2)EL3, where EL3 is the L3 ionization threshold. The A20 values have been deduced from measurements of the Ll (L3 → M1), Lα2 (L3 → M4), and Lα1 (L3 → M5) x-ray angular distributions using thin targets. The beam energies have been selected above the threshold energy of each L subshell in order to also investigate the influence of the Coster-Kronig transitions on the anisotropy of x-ray emission. The results provide a clear indication of alignment and agree with calculations carried out within the plane-wave Born approximation up to about 6EL3 , but an unpredicted inversion in the sign of A20 is observed above this energy.
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BARROS, Suelen f., VANIN, V.r., MANGIAROTTI, A., MAIDANA, N.l., FERNÁNDEZ VAREA, José maría. Atomic alignment of 73Ta, 74W, and 79Au after 𝐿3 subshell ionization by 10–100-keV electron impact. _Physical Review A_. 2019. Vol. 100, núm. 1-14. [consulta: 26 de febrer de 2026]. ISSN: 2469-9926. [Disponible a: https://hdl.handle.net/2445/218457]