| Full text | |
| Author(s): |
Barros, Suelen F.
;
Vanin, Vito R.
;
Mangiarotti, Alessio
;
Maidana, Nora L.
;
Fernandez-Varea, Jose M.
Total Authors: 5
|
| Document type: | Journal article |
| Source: | PHYSICAL REVIEW A; v. 100, n. 6, p. 14-pg., 2019-12-10. |
| Abstract | |
The alignment parameter A(20) of Ta-73, (7)4W, and Au-79 ions after L-3 subshell ionization by electron impact has been determined experimentally and theoretically in the wide energy range (1.02-10.2)E-L3, where E-L3 is the L-3 ionization threshold. The A(20) values have been deduced from measurements of the Ll (L-3 -> M-1), L alpha(2) (L-3 -> M-4), and L alpha(1) (L-3 -> M-5) 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 6E(L3), but an unpredicted inversion in the sign of A(20) is observed above this energy. (AU) | |
| 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 |
| 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 |