| Full text | |
| Author(s): |
Barros, Suelen F.
[1, 2]
;
Vanin, Vito R.
[1]
;
Maidana, Nora L.
[1]
;
Malafronte, Alexandre A.
[1]
;
Fernandez-Varea, Jose M.
[1, 3, 4]
;
Pindzola, Michael S.
[5]
Total Authors: 6
|
| Affiliation: | [1] Univ Sao Paulo, Inst Fis, Rua Matao 1371, Cidade Univ, BR-05508090 Sao Paulo, SP - Brazil
[2] Inst Fed Sao Paulo, Rua Primeiro Maio 500, BR-08571050 Itaquaquecetuba, SP - Brazil
[3] Univ Barcelona, Fac Fis FQA, Diagonal 645, ES-08028 Barcelona, Catalonia - Spain
[4] ICC, Diagonal 645, ES-08028 Barcelona, Catalonia - Spain
[5] Auburn Univ, Dept Phys, Auburn, AL 36849 - USA
Total Affiliations: 5
|
| Document type: | Journal article |
| Source: | PHYSICAL REVIEW A; v. 105, n. 1 JAN 25 2022. |
| Web of Science Citations: | 0 |
| Abstract | |
We report experimental and theoretical Bi L1, L2, and L3 subshell ionization cross sections by the impact of electrons with energies from the Bi L3 ionization threshold to 100 keV. The x-ray spectra have been acquired with two Si drift detectors placed in vacuum, which allowed us to better evaluate the peak fit procedure in the L multiplet. The L alpha, L43, L gamma , Le, and Lq x-ray production cross sections, measured with relative uncertainties ranging from 5% to 9%, and two sets of atomic relaxation parameters have been used to derive the Bi L1, L2, and L3 ionization cross sections. Although the experimental uncertainties of the subshell ionization cross sections are smaller than those of the few previous measurements, they remain large due to the uncertainties associated with the relaxation parameters. Furthermore, ionization cross sections have been calculated for the three L subshells with the subconfiguration average distorted-wave (SCADW) formalism, which includes the full two-body retarded electromagnetic interaction between the projectile and target electrons. These theoretical cross sections are 15% to 30% lower than the measured values, but the agreement is reasonable given the aforementioned high uncertainties. We have also found that the simpler distorted-wave Born approximation yields subshell ionization cross sections that match those computed with the SCADW method. (AU) | |
| FAPESP's process: | 15/14530-7 - Inner shell atomic ionization by impact of electrons with energy between 10 keV and 5 MeV in the São Paulo Microtron |
| Grantee: | Vito Roberto Vanin |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 16/13116-5 - Systematic measurements of electron and proton multiple scattering with energies up to 5 MEV |
| Grantee: | Alessio Mangiarotti |
| Support Opportunities: | Research Grants - Young Investigators Grants |
| FAPESP's process: | 13/24803-5 - Measurement of the atomic alignment by electron impact from L x-rays angular distribution |
| Grantee: | Suelen Fernandes de Barros |
| Support Opportunities: | Scholarships in Brazil - Doctorate |