Atomic manybody effects and Lamb shifts in alkali metals
Abstract
We present a detailed study of the radiative potential method [V. V. Flambaum and J. S. M. Ginges, Phys. Rev. A 72, 052115 (2005), 10.1103/PhysRevA.72.052115], which enables the accurate inclusion of quantum electrodynamics (QED) radiative corrections in a simple manner in atoms and ions over the range 10 ≤Z ≤120 , where Z is the nuclear charge. Calculations are performed for binding energy shifts to the lowest valence s , p , and d waves over the series of alkalimetal atoms Na to E119. The high accuracy of the radiative potential method is demonstrated by comparison with rigorous QED calculations in frozen atomic potentials, with deviations on the level of 1%. The manybody effects of core relaxation and second and higherorder perturbation theory on the interaction of the valence electron with the core are calculated. The inclusion of manybody effects tends to increase the size of the shifts, with the enhancement particularly significant for d waves; for K to E119, the selfenergy shifts for d waves are only an order of magnitude smaller than the s wave shifts. It is shown that taking into account manybody effects is essential for an accurate description of the Lamb shift.
 Publication:

Physical Review A
 Pub Date:
 May 2016
 DOI:
 10.1103/PhysRevA.93.052509
 arXiv:
 arXiv:1603.09116
 Bibcode:
 2016PhRvA..93e2509G
 Keywords:

 Physics  Atomic Physics
 EPrint:
 12 pages