content_image/355366.jpg
<img src='content_image/355366.jpg'>

∗ Corrected for the nuclear deformation effect and the rms value from Ref. [16]. 

## IV. SCREENED QED CORRECTIONS 

The screened QED contribution Δ E$_{scrQED}$ incorporates the screened SE Δ E$_{scrSE}$ and screened VP Δ E$_{scrVP}$ corrections. As concerns the QED part of the two-photon exchange correction, it is included in the electronic-structure contribution (see the previous section). 

Therefore, here we restrict ourself with the contributions of the screened SE and VP terms into the 2 p$_{j}$ − 2 s transition energies of Li-like ions. 

First estimates of the screened QED corrections in Li-like ions were performed in Refs. [1– 3, 49, 50], where these corrections were included either phenomenologically or partly. The rigorous evaluations of the screened SE and VP corrections were first performed in works [4, 57] and [5], respectively. These calculations incorporate the second-order QED effects starting with the pure Coulomb potential as the zeroth-order approximation (the original Furry picture). Later, in case of Li-like bismuth, these corrections were calculated starting with a local screening potential (the extended Furry picture) [9]. 

In the present paper the screened SE and VP corrections are evaluated within the ex- tended Furry representation for the ionization energies of the 2 s , 2 p$_{1}$$_{/}$$_{2}$ , and 2 p$_{3}$$_{/}$$_{2}$ states of 

