Vladimir G Ivanov

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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 of precision theory and experiment for the hfs intervals. We pay a special attention to a specific difference, D21 = 8E hfs (2s) − E hfs (1s), which is known(More)
The mass of the electron is a fundamental physical constant , up to now known to a relative precision of 2.1×10 −9 from an experiment by Farnham et al. [1] who carried out measurements subsequently observing a single 12 C 6+ ion and alternately clouds of 5 – 13 electrons in a Penning trap. They obtained m e = 0.000 548 579 911 1 (12) u. The recent(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 radiative corrections the result for hydrogen atom and helium ion appears as an extrapolation of the numerical data from medium to low Z. An approach to a plausible(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 other objects. Investigation of electromagnetic properties of particles and nuclei provides important information on fundamental constants. In addition, one can also learn(More)
Production of gaseous hydrocarbons by the microbial community of the Posolsky Bank methane seep bottom sediments (southern Baikal) was studied at 4°C. Formation of both methane and a heavier gaseous hydrocarbon, ethane, was detected in enrichment cultures. The highest methane concentrations (6.15 and 4.51 mmol L−1) were revealed in enrichments from the(More)
Effects of vacuum polarization modify the energy levels in atoms with an orbiting particle heavier than an electron. The dominant effect is due to the Uehling potential. In this paper we consider the relativistic corrections to the energy levels caused by the Uehling potential and in particular the fine structure in muonic and antiprotonic atoms. We derive(More)
— We consider the most accurate tests of bound state QED theory of the hyperfine splitting in two-body atoms related to the HFS interval of the 1s state in muonium and positronium and the 2s state in hydrogen, deuterium and the helium-3 ion. We summarize their QED theory and pay special attention to involved effects of strong interactions and to recent(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 ∆n = 0 and ∆l = 0. Here we consider the Lamb shift in the leading nonrelativistic approximation, i.e., within an approach based on a certain Schrödinger equation.(More)
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