135 citations · 152 across the 5 of their papers we have counts for
13 papers
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…
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…
Atomic Clocks and Constraints on Variations of Fundamental Constants
Savely G. Karshenboim, Victor Flambaum, Ekkehard Peik
We consider an application of precision frequency measurements to searches for possible time variations of the fundamental physical constants. Current laboratory constraints on var…
Precision Study of Positronium: Testing Bound State QED Theory
Savely G. Karshenboim
As an unstable light pure leptonic system, positronium is a very specific probe atom to test bound state QED. In contrast to ordinary QED for free leptons, the bound state QED theo…
Time and Space Variation of Fundamental Constants: Motivation and Laboratory Search
Savely G. Karshenboim
Fundamental physical constants play important role in modern physics. Studies of their variation can open an interface to new physics. An overview of different approaches to a sear…
Precision Optical Measurements and Fundamental Physical Constants
Savely G. Karshenboim
A brief overview is given on precision determinations of values of the fundamental physical constants and the search for their variation with time by means of precision spectroscop…