QED effects in 1s and 2s single and double ionization potentials of the noble gases

Abstract

<div lang="en" class="abs"><p class="abs_header">Abstract</p><p>We present calculations on the quantum electrodynamics (QED) effects in 1s and 2s single and double ionization potentials of noble gases from Ne to Rn as perturbations on relativistic four-component Dirac-Fock wavefunctions. The most dominant effect originates from the self-energy of the core-electron that yields corrections of similar order as the transverse interaction. For 1s ionization potentials, a match within few eV against the known experimental values is obtained, and our work reveals considerable QED effects in the photoelectron binding energies across the periodic table — most strikingly even for Ne. We perform power-law fits for the corrections as a function of Z and interpolate the QED correction of ∼−0.55 eV for S1s. Due to this, the K-edge electron spectra of the third row and below need QED for a match in the absolute energy when using state-of-the-art instrumentation.</p></div>