MASS SPECTROMETRIC STUDIES OF MOBILITIES, DIFFUSION, AND REACTIONS OF IONS IN GASES.
Final rept. 1 Apr 66-30 Jun 70,
GEORGIA INST OF TECH ATLANTA SCHOOL OF PHYSICS
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A previously developed Drift Tube Mass Spectrometer apparatus, for the study of the drift transport in weak fields of low density ion swarms in gases, has been applied to the quantitative measurement of drift velocities and mobilities, of longitudinal and transverse diffusion coefficients, and of the nature, order, and rate coefficients of ion-molecule reactions. Completed studies include, in the gases H2, D2, N2, O2, and NO, all of the positive and for O2 and NO also the negative ion species found to be formed from the molecules of the gas by electron bombardment, or formed by reactions of such primary ions with the molecules of the gas. The mean ion energies, controlled by the ratio of the electric field strength E to the gas number density N, vary from essentially thermal energy at room temperature to as much as several electron-Volts, over the range of EN of the measurements. A comprehensive though qualitative description is given of the very significant advances that have been made in the capabilities of ion swarm methods to yield new kinds of basic measurements and results of unprecedented accuracy. Author
- Atomic and Molecular Physics and Spectroscopy