Quantum Electrodynamics Corrections to the2PFine Splitting in Li

Abstract

We consider quantum electrodynamics (QED) corrections to the fine splitting E(2P 3/2 ) − E(2P 1/2 ) in the Li atom. We derive complete formulas for the m α 6 and m α 7 ln α contributions and calculate them numerically using highly optimized, explicitly correlated basis functions. The obtained results resolve disagreement between measurements and lay the foundations for investigation of QED effects in light, many-electron atoms.

Collinear laser spectroscopy at ISOLDE: new methods and highlights

“…The investigation of both lines of the 2s S 2p P 2 1 2 2 1 2,3 2  fine structure doublet also yielded information on the fine-structure splittings for all isotopes [43]. These are in reasonable agreement with advanced calculations by Puchalski and Pachucki [44] and provided an important test of many-body non-relativistic bound-state quantum electrodynamics theory. Nearly all experiments discussed in this section have used bunched beams from the ISCOOL ion cooler-buncher [13].…”

Relativistic configuration-interaction calculations of the energy levels of the 1s22l and 1s2l2l′Yerokhin1, Surzhykov2, Müller3 2017Phys. Rev. A3410333View full textAdd to dashboardCite

“…For light atoms, the presently most powerful calculational approach is based on the nonrelativistic quantum electrodynamics (NRQED) expansion of energy levels in powers of α and Zα (where α is the finestructure constant and Z is the nuclear charge number). Highprecision NRQED calculations were performed by Puchalski and Pachucki for the lowest-lying states of Li and Be + [1][2][3]. In the region of heavy ions, the best results are presently obtained within the alternative approach that accounts for all orders in the nuclear binding strength parameter Zα but expands in the electron-electron interaction parameter 1/Z.…”

Precision Test of Many-Body QED in theBe+2pFine Structure Doublet Using Short-Lived Isotopes

“…The main reason is the considerably more difficult application of the three-electron computational methods with explicitly correlated functions as compared to the two-electron ones. Nevertheless, it has been recently possible to perform the complete calculation of mα 6 and mα 7 × ln α contributions to the lithium fine structure [6] leading to the most accurate QED test with lithium atoms.…”