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Mass Spectrometric Observation of Polymers of Carbon Dioxide in a Molecular Beam System

Volume 19, Number 1 (Jan. 1965) Page 18-21

Cuthbert, J.; Preece, E.R.; Turnbull, A.H.


The operation of a mass spectrometer equipped with a molecular beam gas sampling system is described. Polymeric ions, (CO2)n+ where n varies from two to twelve, are observed when sampling CO2 at 1 to 6.5 atm; similar polymers are found in SO2 and N2O. A possible explanation is advanced in terms of isentropic expansion in the sampling process and subsequent condensation.