Interaction potential, transport properties, and velocity distributions ofNa+ions in Ne

Dynamic properties and third order diffusion coefficients of ions in electrostatic fields

“…This feature is studied further by calculating correlation functions for rapidly moving ions in the z-direction alone. It is thus confirmed that the observed nonmonotonicity of the correlation functions is related directly with the correlations suggested by Ong et al 8 Even more, the form of these functions reveal the dynamics of the mesoscopic ion motion.…”

“…However, as has been inferred, for example, from an MC simulation of Na ϩ in Ne at high fields the v distribution function acquires an egglike cylindrical form which is inseparable as a product of functions that depend on different v components. 8 This inseparability has been attributed to correlations between v Z and v X or v Y .…”

“…For example, it has been suggested in the past by Ong et al, 8 in order to explain the form of the velocity distribution of Na ϩ in Ne obtained from Monte Carlo ͑MC͒ simulations, essentially that ions of high v Z components should acquire with increased probability also high v X and v Y components. Such correlations and their evolution in time, that is their dynamics, can be studied through specific correlation functions, like ͗⌬v Z (0)͉⌬v X (t)͉͘, or the ones we employ here for the calculation of diffusion coefficients, such as ͗⌬v Z (0) ϫ͕⌬v X (t)͖ 2 ͘ and ͗⌬v Z (0)͕⌬v Y (t)͖ 2 ͘.…”

Transverse diffusion measurements and Monte Carlo simulation studies of Rb+ ions in Kr and Xe

“…However minor contributions to the measurement error in the pressure measurements, in the estimation of the drift length and in the approximations made in deriving the equation for the ion current density spectrum give an overall error for the experimental data of less than Ϯ3%. Values of D T /K and D L /K are expressed more usefully in a reduced form 14 given by…”

“…[1][2][3][4][5][6][7] However, there is a dearth of experimental data for D T or D T /K of sufficient accuracy. [3][4][5][6][7][8][9][10][11][12][13][14][15] The only experimental data reported for both Rb ϩ -Kr and Rb ϩ -Xe systems are values of the reduced mobility ͑K 0 ͒, 16 and the product of the neutral gas number density and longitudinal diffusion coefficient ͑ND L ͒. 17 These data were compiled in numerical form by Ellis et al 18 To our knowledge, no transverse diffusion data has yet been reported for Rb ϩ ions drifting in Kr and Xe gases.…”