High-accuracy isotope abundance measurements for metrology
The uncertainty achievable in the direct determination of a number of fundamental constants depends directly on the uncertainty with which their molar masses can be determined. This paper describes a mass spectrometer specifically designed for the measurement of isotopic abundance ratios, and its characteristics are compared with those of a conventional mass spectrometer. Most of the systematic effects previously observed in mass spectrometry can be reduced to values which are so small that individual calibration with synthetic mixtures can often be disregarded. Enriched Si isotopes used as an example were measured and relative uncertainties less than 3.0 x 1.0 E-7 were attained for their molar masses.
Bibliographic Reference: Article: PTB-Mitteilungen, Vol. 104 (1994) pp. 225-236
Record Number: 199411137 / Last updated on: 1994-11-25
Original language: en
Available languages: en