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Abstract

In the ’absolute’ isotope ratio gas mass spectrometer, the MAT 271 IRMS, ion currents arising from isotopically distinct molecules are measured by using a single Faraday cup in peak jumping mode and by calculating mean ratios of recorded ion currents at well defined mass positions. During the measurement, the sample in the expansion vessel of the spectrometer changes in isotopic composition as a function of time because the effusion from the expansion vessel through the gold foil at the inlet of the spectrometer is mass dependent. Extrapolation of the measurement results to the time of start is therefore necessary to determine the initial isotopic composition of the sample.

Additional information

Authors: VALKIERS S, European Commission, Joint Research Centre, Institute for Reference Materials and Measurements, Geel (BE);VARLAM M, European Commission, Joint Research Centre, Institute for Reference Materials and Measurements, Geel (BE);BERGLUND M, European Commission, Joint Research Centre, Institute for Reference Materials and Measurements, Geel (BE)
Bibliographic Reference: EUR 22509 EN (2006), 14 pp. Free of charge
Availability: http://bookshop.europa.eu/is-bin/INTERSHOP.enfinity/WFS/EU-Bookshop-Site/en_GB/-/EUR/ViewPublication-Start?PublicationKey=LANA22509 (Catalogue Number: LA-NA-22509-EN-C)
ISBN: ISBN: 92-79-03513-4
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