We report the 2018 self-consistent values of constants and conversion factors of physics and
chemistry recommended by the Committee on Data of the International Science Council …

The extremely precise extraction of the proton radius obtained by Pohl et al. from the
measured energy difference between the 2 P and 2 S states of muonic hydrogen disagrees …

1.1. Background This article reports work carried out under the auspices of the Committee
on Data for Science and Technology (CODATA) Task Group on Fundamental Constants. 1 It …

1.1. Background This paper gives the complete 2006 CODATA self-consistent set of
recommended values of the fundamental physical constants and describes in detail the …

Positronium (Ps) is an exotic hydrogenic atom composed of an electron bound to a positron
via the Coulomb force. Being composed of two low-mass leptons, positronium is, for all …

Theoretical energy levels of the n= 1 and n= 2 states of hydrogen-like atoms with the nuclear
charge numbers 1≤ Z≤ 110 are tabulated. The tabulation is based on ab initio quantum …

We calculate ionization energies and fundamental vibrational transitions for H 2+, D 2+, and
HD+ molecular ions. The nonrelativistic quantum electrodynamics expansion for the energy …

We have derived the complete formula for the α 7 m contribution to energy levels of an
arbitrary triplet state of the helium atom, performed numerical calculations for the 2 3 S and 2 …

The current status of bound state quantum electrodynamics calculations of transition
energies for few-electron ions is reviewed. Evaluation of one and two body QED correction …

Atomic high-precision measurements have become a competitive and essential technique
for tests of fundamental physics, the Standard Model, and our theory of gravity. It is therefore …