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 …

Theoretical chemistry could be seen as a bridge from the real physics of the physicists to the
real chemistry of the experimental chemists. We hence expect that any measurable property …

This paper gives the 1998 self-consistent set of values of the basic constants and conversion
factors of physics and chemistry recommended by the Committee on Data for Science and …

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 …

Highly accurate results from frequency measurements on neutral hydrogen molecules H 2,
HD, and D 2 as well as the HD+ ion can be interpreted in terms of constraints on possible …

Experimental work on cold, trapped metastable noble gases is reviewed. The aspects which
distinguish work with these atoms from the large body of work on cold, trapped atoms in …

The remarkable precision of frequency-comb (FC) lasers is transferred to the extreme
ultraviolet (XUV, wavelengths shorter than 100 nm), a frequency region previously not …

We critically examine the current status of theoretical calculations of the energies, the fine
structure, and the isotope shift of the lowest-lying states of helium, searching for unresolved …

Precision spectroscopy of simple atomic systems has refined our understanding of the
fundamental laws of quantum physics. In particular, helium spectroscopy has played a …

We have measured the ground-state g factor of boronlike argon Ar 40 13+ with a fractional
uncertainty of 1.4× 10-9 with a single ion in the newly developed Alphatrap double Penning …