Precision Spectroscopy in the Helium Atom

Abstract

Few electron atoms and molecules such as H, He(+), H2(+) and He2(+) are simple enough for their properties to be calculated exactly from first principles (QM, QED). Comparison with precision-spectroscopic data enables one to test the calculations, reduce the uncertainties of fundamental constants and determine particle properties (e.g. α, mp/me and RH) or may allow for the identification of new phenomena (e.g. lepton-universality violation, fifth forces, spatialtemporal variation of fundamental constants). I present precision measurements in the helium atom reaching a relative uncertainty of 10^-12.

References

• https://journals.aps.org/prl/pdf/10.1103/PhysRevLett.131.103001