The Correlation of the N{sub A} Measurements by Counting {sup 28}Si Atoms

Journal Article · Tue Sep 15 00:00:00 EDT 2015 · Journal of Physical and Chemical Reference Data

DOI:https://doi.org/10.1063/1.4921240· OSTI ID:22493964

Massa, E.; Sasso, C. P. ^[1]; Stock, M. ^[2]; Fujii, K.; Kuramoto, N.; Mizushima, S.; Narukawa, T. ^[3]; Borys, M.; Busch, I.; Nicolaus, A.; Pramann, A. ^[4]

---

1. INRIM—Istituto Nazionale di Ricerca Metrologica, Str. delle Cacce 91, 10135 Torino (Italy)
2. BIPM—Bureau International des Poids et Mesures BIPM, Pavillon de Breteuil, 92312 Sèvres Cedex (France)
3. NMIJ—National Metrology Institute of Japan, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8563 (Japan)
4. PTB—Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig (Germany)

An additional value of the Avogadro constant was obtained by counting the atoms in isotopically enriched Si spheres. With respect to the previous determination, the spheres were etched and repolished to eliminate metal contaminations and to improve the roundness. In addition, all the input quantities—molar mass, lattice parameter, mass, and volume—were remeasured aiming at a smaller uncertainty. In order to make the values given in Andreas et al. [Metrologia 48, S1 (2011)] and Azuma et al. [Metrologia 52, 360 (2015)] usable for a least squares adjustment, we report about the estimate of their correlation.

• OSTI ID: 22493964
• Journal Information: Journal of Physical and Chemical Reference Data, Vol. 44, Issue 3; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0047-2689
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ATOMS
CORRELATIONS
LATTICE PARAMETERS
LEAST SQUARE FIT
MASS
METALS
SILICON
SILICON 28