Title :
A more accurate value for the Avogadro constant
Author :
De Biévre, P. ; Valkiers, S. ; Peiser, S. ; Becker, P. ; Lüdicke, F. ; Spieweck, F. ; Stümpel, J.
Author_Institution :
Inst. for Reference Mater. & Meas., Comm. of the Eur. Communities, Geel, Belgium
fDate :
4/1/1995 12:00:00 AM
Abstract :
Significant improvements in the method for determining the absolute molar mass of silicon have been achieved and are reported. They have led to a reduction in the uncertainty of the molar mass and hence in its contribution to the uncertainty of a previously published Avogadro constant NA. The new value for NA is almost unchanged at 6.022 136 5×1023 mol-1 but the uncertainty is reduced to 0.000005 1×NA
Keywords :
atomic mass; constants; density measurement; isotopes; mass measurement; measurement errors; silicon; Avogadro constant; Si; Si isotopes; absolute molar mass; ion analyser; ion source; measurement errors; residual pressure; uncertainty; Bicycles; Equations; Fractionation; Ion beams; Ion sources; Isotopes; Mass spectroscopy; Pressure measurement; Silicon; Uncertainty;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
