Transport properties of gaseous ions over a wide energy range. Part III

Abstract

This paper updates and extends in scope our two previous papers entitled “Transport Properties of Gaseous Ions over a Wide Energy Range.” The references to the earlier publications (referred to as “Part I” and “Part II”) are I, H. W. Ellis, R. Y. Pai, E. W. McDaniel, E. A. Mason, and L. A. Viehland,Atomic Data and Nuclear Data Tables17, 177–210 (1976); and II, H. W. Ellis, E. W. McDaniel, D. L. Albritton, L. A. Viehland, S. L. Lin, and E. A. Mason,Atomic Data and Nuclear Data Tables22, 179–217 (1978). Parts I and II contained compilations of experimental data on ionic mobilities and diffusion coefficients (both longitudinal and transverse) for ions in neutral gases (almost exclusively at room temperature) in an externally applied field. The data were tabulated as a function of the ionic energy parameter E/N, where E is the electric field intensity and N is the number density of the gas. The coverage of the literature extended up to about August 1978. The criteria for selection of the mobility and diffusion data were (1) the measurements must cover a reasonably wide range of E/N, (2) the identity of the ions must be well established, and (3) the accuracy of the data must be good. Recent important development in the transport theory of gaseous ions were outlined, and utilized to derive quantities from the experimental data that are useful in various applications.The present paper (Part III) extends all aspects of Parts I and II into 1983. In addition, here we compile zero-field mobilities as a function of the gas temperature, zero-field mobilities at fixed gas temperatures, and ratios of the transverse diffusion coefficient to the mobility as a function of E/N. In this compilation we include some experimental data obtained without mass spectrometric selection of the ions, but only in cases where there is little or no uncertainty about the identity of the ions and no confusion related to ion-molecule reactions on the part of the drifting ions.