Measuring ion current ratios on CO2, Assuming complete molecular flow conditions in the inlet system of the mass spectrometer
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.
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
Record Number: 200718865 / Last updated on: 2007-03-01
Original language: en
Available languages: en