论文信息 - Mass determination of silicon spheres used for the Avogadro project

Mass determination of silicon spheres used for the Avogadro project

Abstract Spheres made of a silicon single crystal with a mass of about 1 kg are used as density standards and in the context of a project for the determination of the Avogadro constant. The status of the mass determination of such silicon spheres at the PTB is presented. Special facilities and procedures used for the mass determination in air are described. Results for a single sphere and the mass difference between two spheres are given with a discussion of the measurement uncertainty and mass stability.

Michael Gläser | Michael Borys | Michael Mecke

[1] B. Taylor,et al. CODATA recommended values of the fundamental physical constants: 2006 | NIST , 2007, 0801.0028.

[2] M. Gläser,et al. Comprehensive Mass Metrology , 2000 .

[3] R. Davis,et al. Equation for the Determination of the Density of Moist Air (1981/91) , 1992 .

[4] H Fang,et al. Mass comparisons using air buoyancy artefacts , 2004 .

[5] Barry N. Taylor,et al. Recommended Values of the Fundamental Physical Constants: A Status Report , 1990, Journal of research of the National Institute of Standards and Technology.

[6] R. Davis,et al. A redetermination of the argon content of air for buoyancy corrections in mass standard comparisons , 2004 .

[7] A. Picard,et al. Three methods of determining the density of moist air during mass comparisons , 2002 .

[8] B. Taylor,et al. CODATA Recommended Values of the Fundamental Physical Constants 1998*$\dagger$ , 1999 .

[9] P Giacomo,et al. Equation for the Determination of the Density of Moist Air (1981) , 1982 .

[10] Arnold Nicolaus,et al. Determination of the Avogadro constant via the silicon route , 2003 .

[11] M. Gläser,et al. Experimental Determination of Air Density Using a 1 kg Mass Comparator in Vacuum , 1991 .

[12] R. Schwartz. Precision Determination of Adsorption Layers on Stainless Steel Mass Standards by Mass Comparison and Ellipsometry: Part I: Adsorption Isotherms in Air , 1994 .