Ion mobilities and ion-molecule reaction rates in oxygen

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Abstract
The mobilities and ion-molecule reaction rates for negative oxygen ions have been measured in a drift-tube mass spectrometer as a function of E/N using a pulsed electron source which allows ion transients to be recorded. By curve-fitting these transients using a small digital computer to generate calculated waveforms, the mobilities and reaction rates are obtained by inspection. The rate coefficients for the three-body reaction producing O3 from O− were measured over the E/N range 300-639 Td and were found to agree well with earlier data. The two-body reaction producing O2− from O− was investigated over the E/N range 865-252 Td and again good agreement with earlier work was found. The mobilities of O−, O2− and O3− ions were measured over as large a range of E/N as possible and were found to extrapolate back to zero-field mobilities of 92×1019, 56×1019 and 68×1019 V−1s−1cm−1.

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