Does anyone know the extent of oxygen isotope fractionation which occurs for carbon dioxide WITHIN a mass spectrometer?

In other words, by how much would the ratio of 12C18O16O to 12C16O16O arriving at the collectors differ from the ratio of the gas entering the source? Qualitatively?

Tim H.E. Heaton

NERC Isotope Geosciences Laboratory
British Geological Survey
Keyworth, Nottingham NG12 5GG, England
(www.bgs.ac.uk/nigl/index.htm)

Tel. +44(0)115 936 3401
Email: [log in to unmask]

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