A new type of drift tube was designed and constructed for the study on the behavior of slow ions in gases. The guard ring, made up only of an aluminous porcelain tube, is different from those of conventional thin or thick types. Thick-film resistor for microcircuits was coated over the inner surface of the tube. With this guard ring a new swarm experiment was carried out: the drift distance scanning method. Spectra representing the spatial distribution of ions for fixed drift times were obtained. Mobilities and longitudinal diffusion coefficients of K+ ions in oxygen were measured in a trial and compared with the data obtained by a conventional analysis of the arrival time spectra.
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Iinuma et al. (1982) studied this question.
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