Atoms which can bind positrons

TL;DR

This paper calculates positron binding energies for all atoms, identifying which atoms can bind positrons, and provides recommended values for ground and excited states, aiding experimental measurements.

Contribution

It offers comprehensive calculations of positron binding energies across the periodic table, including new data on excited states and resonances.

Findings

Atoms with positive binding energies identified

Recommended binding energy values provided for ground states

Predicted narrow resonances useful for experimental detection

Abstract

Calculations of the positron binding energies to all atoms in the periodic table are presented and atoms where the positron-atom binding actually exists are identified. The results of these calculations and accurate calculations of other authors (which existed for several atoms only) are used to evaluate recommended values of the positron binding energies to the ground states of atoms. We also present the recommended energies of the positron excited bound levels and resonances (due to the binding of positron to excited states of atoms) which can not emit positronium and have relatively narrow widths. Such resonances in positron annihilation and scattering may be used to measure the positron binding energy.