The present status and recent developments in the theory of light hydrogenic atoms,
electronic and muonic, are extensively reviewed. The discussion is based on the quantum …

The comparison of theory and experiment for energy levels of strongly bound electrons
provides a critical test of quantum electrodynamics in strong fields. A theoretical evaluation …

The fine structure constant is one of the fundamental constants of nature characterizing the
whole range of physics including elementary particle, atomic, mesoscopic and macroscopic …

In last few years significant progress has been achieved both in the experimental technique
and the theoretical methods for the determination of the energy levels of simple hydrogenic …

The binding correction of the two-loop contribution to the Lamb shift in hydrogenlike atoms is
calculated by a combined analytical and numerical method. A new theoretical value for the …

The pure recoil correction to hydrogenlike energy levels is revisited. An alternative method
for its evaluation is presented. We confirm that the previous result [Doncheski et al., Phys …

We report a calculation of all two-loop quantum electrodynamics corrections with closed
fermion loops for the n= 1 and n= 2 states of H-like ions and for a wide range of the nuclear …

Experimental knowledge and theoretical understanding of the deuteron matter radius are
reviewed. An experimental value of rm (exp)= 1.9502 (20) fm is found by using the 1962 …

Proceeding towards the evaluation of the complete set of radiative corrections of order α 2 to
the energy levels of hydrogenlike systems, the second-order self-energy–vacuum …

The radiative correction to the nuclear charge radius contribution to the Lamb shift of order α
(Z α) 5 mr 3< r 2> is calculated. In view of the recent high-precision experimental data, this …