Avogadro and molar Planck constants for the redefinition of the kilogram

A model to estimate the uncertainty of the phase-correction in sphere-diameter measurements

2012

Metrologia

International determination of the Avogadro constant (Foreword to Metrologia 48(2)- Special Issue)

2011

Metrologia

Novel concept for the mass spectrometric determination of absolute isotopic abundances with improved measurement uncertainty: Part 3—Molar mass of silicon highly enriched in 28Si

2011

International Journal of Mass Spectrometry

Determination of the Avogadro Constant by Counting the Atoms in a 28Si Crystal

2011

Physical Review Letters

Novel concept for the mass spectrometric determination of absolute isotopic abundances with improved measurement uncertainty: Part 2 – Development of an experimental procedure for the determination of the molar mass of silicon using MC-ICP-MS

2011

International Journal of Mass Spectrometry

Phase corrections in the optical interferometer for Si sphere volume measurements at NMIJ

2011

Metrologia

Surface layer determination for the Si spheres of the Avogadro project

2011

Metrologia

Volume determination of the Avogadro spheres of highly enriched 28Si with a spherical Fizeau interferometer

2011

Metrologia

Infrared spectrometric measurement of impurities in highly enriched ‘Si28’

2011

Metrologia

Molar mass of silicon highly enriched in 28Si determined by IDMS

2011

Metrologia

Si primary standards for the calibration of ion-current ratios in the molar-mass measurement of natural Si single crystals

2011

Metrologia

Measurement of the {2 2 0} lattice-plane spacing of a 28Si x-ray interferometer

2011

Metrologia

The isotopic composition of enriched Si: a data analysis

2011

Metrologia

The lattice parameter of the 28Si spheres in the determination of the Avogadro constant

2011

Metrologia

The self-weight deformation of an x-ray interferometer

2011

Metrologia

State-of-the-art mass determination of 28Si spheres for the Avogadro project

2011

Metrologia

Calibration of a silicon crystal for absolute nuclear spectroscopy

2010

Journal of Applied Crystallography

Two-wave approximation in surface effects in asymmetric Laue crystals

2010

Acta Crystallographica Section A Foundations of Crystallography

Measurement equations for the determination of the Si molar mass by isotope dilution mass spectrometry

2010

Metrologia

Fast and easy Bragg reflex search for Berg-Barrett topography of misoriented crystals

2010

Journal of Applied Crystallography

Towards an atomic realization of the kilogram: The measurements of NA and NAh

2010

European Physical Journal Special Topics

The calibration of Si isotope ratio measurements

2010

International Journal of Mass Spectrometry

Interferometric determination of the topographies of absolute sphere radii using the sphere interferometer of PTB

2010

Measurement Science and Technology

Observation of a bent crystal-lattice by x-ray interferometry

2010

Optics Express

Aperture Correction for a Sphere Interferometer

2009

Metrologia

The marathon race to a new atomic kilogram

2009

Europhysics News

Investigations on Diameter Measurements of the Avogadro Silicon Sphere Dependent on the Position in the Field of View of the Interferometer Optics

2009

IEEE Transactions on Instrumentation and Measurement

Novel concept for the mass spectrometric determination of absolute isotopic abundances with improved measurement uncertainty: Part 1 – theoretical derivation and feasibility study

2009

International Journal of Mass Spectrometry

Uncertainty assessment of Si molar mass measurements

2009

International Journal of Mass Spectrometry

Estimation of the centre of a diffraction peak by triggering the goniometer-angle readings via photon detection

2009

Journal of Applied Crystallography

Measurement of the lattice parameter of a silicon crystal

2009

New Journal of Physics

Determination of the Avogadro constant. A contribution to the new definition of the mass

2009

French College of Metrology

Hat das Urkilogramm bald ausgedient?

2009

Physik in unserer Zeit

The Avogadro constant determination via enriched silicon-28

2009

Measurement Science and Technology

A validity test of E = mc^2

2009

European Physical Journal Special Topics

Oxide Layer Mass Determination at the Silicon Sphere of the Avogadro Project

2009

IEEE Transactions on Instrumentation and Measurement

Determination of the Avogadro constant – A contribution to the new definition of the mass unit kilogram

2009

The European Physical Journal Special Topics

Comparison of the INRIM and PTB lattice-spacing standards

2009

Metrologia

The coeffcient of thermal expansion of highly enriched 28Si

2009

Metrologia

Infuence of the distribution of measuring points on the mean diameter determination of the Avogadro project’s silicon spheres

2009

Measurement Science and Technology

X-ray and gamma-ray propagation in bent crystals with flat and cylindrical surfaces

2008

Acta Crystallographica Section A

Influence of surface stress in the determination of the (220) lattice spacing of silicon

2008

Metrologia

Si lattice parameter measurement by centimeter X-ray interferometry

2008

Optics Express

Mass comparison of the 1kg silicon sphere AVO#3 traceable to the International Prototype K

2008

Metrologia

Participating EURAMET NMIs and DIs
INRIM (Italy)
PTB (Germany)

Information