Self-absorption of Mβ photons across the M5 edge for elements with 70 ≤ Z ≤ 80

J. TRINCAVELLI; A. CARRERAS; M. TORRES DELUIGI; D.M. MITNIK; S. LIMANDRI; S. SEGUI; G. CASTELLANO

Toyama

Conferencia; 26th International Conference on Ion Beam Analysis y 18th International Conference on Particle Induced X-ray Emission (IBA-PIXE2023); 2023

IBA&PIXE

The description of the Mβ self-absorption in pure Re and Os targets has shown to depend critically on the EM5 value, as well as on the mass absorption coefficient (μ) jump ratio across this edge.With this motivation, in the present work WDS pure spectra induced by 20 keV electrons have been acquired in an SEM to survey the bremsstrahlung absorption around the M5 edge. Thepredicted background contribution is not suitable when using the value reported in the literature. A better spectral fitting is attained when the M5 edge is shifted around 26 eV towards higher energies.Fully relativistic calculations implemented by using the HULLAC suite have been performed for solving the many-electron Dirac equation, to provide an estimate for the configuration energy associated with M5 one-vacancy states. The obtained results are in good agreement withthe experimental determination of EM5 values.