Testing strong-field QED to second-order in the highly correlated atomic system berylliumlike Pb78+ by electron-ion recombination spectroscopy

2025/02/21 by Schippers, S., Brandau, C., Fuchs, S. +33 · 1 citation
#Atomic Physics (physics.atom-ph) #FOS: Physical sciences

paper · doi:10.48550/arxiv.2502.15433

Abstract

A low-energy storage ring with an ultracold electron cooler has been coupled with a heavy-ion accelerator facilitating high-resolution electron-ion collision spectroscopy of the heaviest few-electron ions. In the present work resonant electron-ion recombination of berylliumlike Pb⁷⁸⁺ ions was measured in the collision-energy range 9.3-16.5eV and a value of 244.937(30) eV is derived for the Pb⁷⁸⁺(2s^{2 1}S₀ - 2s 2p ³P₁) excitation energy. This result agrees with the most recent (less accurate) theoretical value of 244.942(52) eV [Malyshev et al., Physical Review A 110, 062824 (2024)], which has been calculated by applying strong-field QED rigorously up to the second order. The present investigation suggests that further technical improvements can potentially increase the experimental accuracy by an order of magnitude.

Cited by

• Direct Neutron Reactions in Storage Rings Utilizing a Supercompact Cyclotron Neutron Target

Related

• QED calculations of intra-L-shell singly excited states in Be-like ions
• QED calculations of intra-L-shell doubly excited states in Be-like ions
• Reactive collisions between electrons and BeH+ above dissociation threshold
• Calculations for electron-impact excitation and ionization of beryllium
• First direct ⁷Be electron capture Q-value measurement towards high-precision BSM neutrino physics searches