Positron lifetime calculation of the elements of the periodic table

Abstract

Theoretical positron lifetime values have been calculated systematically for most of the elements of the Periodic Table. Self-consistent and non-self-consistent schemes have been used for the calculation of the electronic structure in the solid, as well as different parameterizations for the positron enhancement factor and correlation energy. The results obtained have been studied and compared with experimental data, confirming the theoretical trends. As it is known, positron lifetimes in bulk show a periodic behaviour with atomic number. These calculations also confirm that monovacancy lifetimes follow the same behaviour. From this fact a strong relation between the atomic volume and the positron lifetime has been set. The effects of enhancement factors used in calculations have been commented. Finally, we have analysed the effects that f and d electrons cause in positron lifetimes.

20 pages, 2 figures, 8 tables

References in corpus (2)

• Modeling the momentum distributions of annihilating electron-positron pairs in solids
• Positron lifetime calculations for defects in Zn

Cited by in corpus (6)

• Proposed parameter-free model for interpreting the measured positron annihilation spectra of materials using a generalized gradient approximation
• Strengthening magnesium by design: integrating alloying and dynamic processing
• Co-evolution of point defects and Cr-rich nano-phase in binary Fe-20 at.% Cr alloy: A comprehensive investigation using positron annihilation spectroscopy and atom probe tomography
• Gradient correction scheme for bulk and defect positron states in materials: New developments
• Sensitiveness of the ratio between monovacancy and bulk positron lifetimes to the approximations used in the calculations: Periodic behaviour
• Breakdown of the Arrhenius Law of the Temperature Dependent Vacancy Concentration in fcc-Lanthanum