Title :
On the molar mass of silicon for a new Avogadro constant
Author :
Meija, J. ; Mester, Z. ; Pramann, A. ; Rabb, S. ; Rienitz, O. ; Schiel, D. ; Sturgeon, R. ; Turk, G. ; Vocke, R., Jr. ; Yang, L.
Author_Institution :
Nat. Res. Council Canada (NRC), Ottawa, ON, Canada
Abstract :
An overview of the present results and status of the molar mass of a silicon crystal highly enriched in 28Si used for a new determination of the Avogadro constant is given with special emphasis on the cooperation between NIST, NRC, and PTB currently working on this topic. Using an experimental combination of multicollector ICP and isotope dilution mass spectrometry, a new approach developed by PTB for the measurement of the isotopic composition has been applied. It focuses on the isotope ratio treatment of 30Si/29Si mainly, avoiding the more uncertain measurement of ratios related to the main isotope 28Si.
Keywords :
elemental semiconductors; mass measurement; mass spectroscopy; measurement uncertainty; silicon; Avogadro constant; NIST; NRC; PTB; Si; isotope dilution mass spectrometry; isotope ratio treatment; isotopic composition measurement; measurement uncertainty; multicollector ICP mass spectrometry; silicon crystal molar mass; Crystals; Isotopes; Measurement uncertainty; NIST; Silicon; Uncertainty; Avogadro constant; isotope dilution mass spectrometry; molar mass; multicollector ICP-mass spectrometry; silicon; uncertainty;
Conference_Titel :
Precision Electromagnetic Measurements (CPEM), 2012 Conference on
Conference_Location :
Washington, DC
Print_ISBN :
978-1-4673-0439-9
DOI :
10.1109/CPEM.2012.6251010
