385 citations · 2.6k across the 90 of their papers we have counts for
9 papers · 1 filter
A New Option for a Search for Alpha Variation: Narrow Transitions with Enhanced Sensitivity
S. G. Karshenboim, A. Yu. Nevsky, E. J. Angstmann +2
We consider several transitions between narrow lines that have an enhanced sensitivity to a possible variation of the fine structure constant, alpha. This enhancement may allow a s…
Corrections to the energy levels of a spin-zero particle bound in a strong field
R. N. Lee, A. I. Milstein, S. G. Karshenboim
Formulas for the corrections to the energy levels and wave functions of a spin-zero particle bound in a strong field are derived. General case of the sum of a Lorentz-scalar potent…
The Uehling correction to the energy levels in a pionic atom
S. G. Karshenboim, E. Yu. Korzinin, V. G. Ivanov
We consider a correction to energy levels in a pionic atom induced by the Uehling potential, i.e., by a free electron vacuum-polarization loop. The calculation is performed for cir…
Precision physics of simple atoms: QED tests, nuclear structure and fundamental constants
Savely G. Karshenboim
Quantum electrodynamics is the first successful and still the most successful quantum field theory. Simple atoms, being essentially QED systems, allow highly accurate theoretical p…
On a natural definition of the kilogram and the ampere: the objectives and consequences
Savely G. Karshenboim
We consider a recent proposal [1] to redefine the kilogram in terms of natural constants. In our opinion, the main objective of the redefinition should be to build such a version o…
Fundamental Physical Constants: Looking from Different Angles
Savely G. Karshenboim
We consider fundamental physical constants which are among a few of the most important pieces of information we have learned about Nature after its intensive centuries-long studies…
Improved theoretical prediction for the 2s hyperfine interval in helium ion
Savely G. Karshenboim, Vladimir G. Ivanov
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…
The factor of an electron or muon bound by an arbitrary central potential
S. G. Karshenboim, R. N. Lee, A. I. Milstein
We consider the factor of a spin-1/2 particle (electron or muon) bound by an arbitrary central field. We present an approach which allows one to express the relativistic fa…
Frequency comparisons and absolute frequency measurements of 171Yb+ single-ion optical frequency standards
E. Peik, B. Lipphardt, H. Schnatz +3
We describe experiments with an optical frequency standard based on a laser cooled Yb ion confined in a radiofrequency Paul trap. The electric-quadrupole transition fro…