2026-04-14T03:01:09Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/2184592025-12-05T16:14:57Zcom_2072_1057col_2072_478823col_2072_478904col_2072_478917

00925njm 22002777a 4500 dc Santos, O.C.B. author Vanin, V.R. author Maidana, N.L. author Martins, M. N. author Tabacniks, M.H. author Rodrigues, C.L. author Silva, T.F. author Santos, A.D. author Barros, Suelen F. author García-Alvarez, J.A. author Koskinas, M.F. author Fernández Varea, José María author Pindzola, M.S. author 2025-02-03T16:24:52Z 2025-02-03T16:24:52Z 2019-01-01 2025-02-03T16:24:52Z In this work we present a combined experimental and theoretical study of K-shell ionization by electrons with energies close to the threshold. The ionization cross sections of the K shells of Te, Ta, and Bi atoms have been measured up to 100 keV with uncertainties ranging from 4% to 8%. In turn, calculations have been done using the subconfiguration average distorted-wave (SCADW) method, which includes the full two-body retarded electromagnetic interaction between the projectile and target electrons. The predictions of the SCADW method are in good agreement with the experimental data. In contrast, theoretical cross sections based on first-order perturbation theory where the transverse interaction is computed with plane waves instead of distorted waves underestimate the SCADW values as well as the experimental data. The difference between the two investigated ab initio formalisms grows with atomic number, being 3% for Te, 15% for Ta, and 25% for Bi. An additional comparison of both theoretical approaches with recent measurements for Au K supports the conclusion that the SCADW method reproduces well the experimental K-shell ionization cross section of atoms with intermediate to large Z near the threshold. Electrons Ionització Energia Electrones Ionization Energy Experimental and theoretical cross sections for 𝐾-shell ionization of 52⁢Te, 73⁢Ta, and 83⁢Bi by electrons with energies up to 100 keV