Va. Yerokhin et al., Evaluation of the two-photon exchange graphs for the 2p(1/2)-2s transitionin Li-like ions - art. no. 032109, PHYS REV A, 6403(3), 2001, pp. 2109
We present ab initio calculations of the complete gauge invariant set of th
e two-photon exchange graphs for the 2p(1/2)-2s transition energy in Li-lik
e high-Z ions. The evaluation is carried out to all orders in Z alpha in th
e range Z = 20-100. Results are compared with calculations based on relativ
istic many-body perturbation theory. All presently available contributions
to the 2p(1/2)-2s transition energy are collected. The resulting theoretica
l predictions are compared with experimental data.