Abstract

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.

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Double optical resonance mass selective detection of aromatic molecules in a supersonic molecular beam

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