This paper gives the 2002 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 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 …

The metastable first excited state of thorium-229, 229mTh, is just a few electronvolts above
the nuclear ground state,,–and is accessible by vacuum ultraviolet lasers. The ability to …

The Planck constant h is one of the most significant constants in quantum physics. Recently,
the precision measurement of the value of h has been a hot issue due to its important role for …

A determination of the Avogadro constant from two selected silicon single-crystals with
natural isotopic compositions is described. The density, molar mass, and lattice spacing of …

Abstract The spacing of the {2 2 0} lattice planes of a 28 Si crystal, used to determine the
Avogadro constant by counting silicon atoms, was measured by combined x-ray and optical …

X-ray interferometry established a link between atomic and macroscopic realisations of the
metre. The possibility of measuring the silicon lattice parameter in terms of optical …

A combined X-ray and optical interferometer capable of centimeter displacements has been
made to measure the lattice parameter of Si crystals to within a 3?? 10^??? 9 relative …

Precision lattice spacing comparison measurements at the National Institute of Standards
and Technology (NIST) provide traceability of X-ray wavelength and powder diffraction …