We consider hyperfine splitting of 1s and, in part, of 2s levels in light hydrogen-like atoms: hydrogen, deuterium, tritium, helium-3 ion, muonium and positronium. We discuss present status ofâ€¦ (More)

Radiative corrections to the 2E1 decay width of the 2s1/2-state in the low-Z hydrogen-like system are examined within logarithmic approximation. The correction is found to be 2.025(1)Î±(ZÎ±)/Ï€ log(ZÎ±)â€¦ (More)

We consider the uncertainty of theoretical calculations for a specific difference of the hyperfine intervals in the 1s and 2s states in a light hydrogen-like atom. For a number of crucial radiativeâ€¦ (More)

In muonic atoms the Uehling potential (an effect of a free electronic vacuum polarization loop) is responsible for the leading contribution to the Lamb shift causing the splitting of states with âˆ†n =â€¦ (More)

Radiative corrections to the decay rate in the low-Z hydrogen-like muonic atoms are considered. The correction arises from the Uehling potential and it has the relative order of Î±. The numericalâ€¦ (More)

Energy levels of a two-body atomic system in an external homogeneous magnetic field can be presented in terms of magnetic moments of their components, however, those magnetic moments being related toâ€¦ (More)

Calculation of higher-order two-loop corrections is now a limiting factor in development of the bound state QED theory of the Lamb shift in the hydrogen atom and in precision determination of theâ€¦ (More)

We consider higher order corrections to the g factor of a bound proton in hydrogen atom and their consequences for a magnetic moment of free and bound proton and deuteron as well as some otherâ€¦ (More)