| Texto completo | |
| Autor(es): |
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]
Número total de Autores: 6
|
| Afiliação do(s) autor(es): | [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
Número total de Afiliações: 5
|
| Tipo de documento: | Artigo Científico |
| Fonte: | PHYSICAL REVIEW A; v. 105, n. 1 JAN 25 2022. |
| Citações Web of Science: | 0 |
| Assunto(s): | Fótons Raios X |
| Resumo | |
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) | |
| Processo FAPESP: | 15/14530-7 - Ionização de camadas atômicas internas por impacto de elétrons com energias de 10 keV a 5 MeV no Microtron de São Paulo |
| Beneficiário: | Vito Roberto Vanin |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 16/13116-5 - Medidas sistemáticas do espalhamento múltiplo de elétrons e prótons com energias até 5 MEV |
| Beneficiário: | Alessio Mangiarotti |
| Modalidade de apoio: | Auxílio à Pesquisa - Jovens Pesquisadores |
| Processo FAPESP: | 13/24803-5 - Medida do alinhamento atômico por impacto de elétrons pela distribuição angular de raios x L |
| Beneficiário: | Suelen Fernandes de Barros |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |