Abstract
The ion CHO + has been identified as the primary chemi-ion in the reaction of oxygen atoms with acetylene, ethylene and isobutane. Low concentrations of reactants in helium were mixed in the annular region between two concentric stainless steel cylinders. The chemi-ions were sampled through a pinhole in the outer cylinder and analyzed by a quadrupole mass spectrometer. By applying an electric field between the two cylinders, the residence time of the ions could be decreased, thereby reducing the importance of secondary ion—molecule reactions. CHO + was the only ion that increased in importance as the electric field was applied, becoming more than 90% of the total ions at high fields. This observation provides strong support for the proposal of Calcote that the reaction, O + CH → CHO + + e −1 is the source of chemi-ionization in hydrocarbon flames.
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