Mobility of gaseous io ns in noble gases: comparison of poten tial models

Analysis of charged particle transport in dilute gases under the i nfluence of electric field s has theoretical and practical app lications in science an d technology [۱]. Investigation of ion mobility in gases is an important issue in applied field s such as plasma chemistry, atmosp heric physic s, and num erical simula tions of industrial plasm a [۲-۷]. There is now available on-line a large amount of data for such analyses [ ۸]. Here, we compare i on mobilities calculated from the MSV-fitted I NVERT potential [۹-۱۱], the classical (n,۶,۴) p otential model [۱۲], an d the Lennard-Jones like (LJL) phe nomenological potential recently proposed by Laricchiuta et al. [۱۳] w ith the experimental data for monatomic, diat omic and t riatomic ions in noble gases. The s ystems studied in this work are: a) HeO+ and HeS+ as exa mples of monatomic io ns in atomi c neutrals; b) ArO۲+ and HeCO+ as prototypes of diatomic ions in atomic neutrals; a nd c) He-SO ۲+ and Ar- SO۲+ as exa mples of tri atomic ions in atomic neutrals. The two-temperature theory of Viehland and Mason [۱۴] has been employ ed to calcul ate the mobility of the i ons in neutral gases. Results show that the MSV-fitted INVERT potential yields ion mobilities in best agreement with experimental data for atomic i ons and diatomic ions in atomic neutral gases. However, in case of triatomic ions in atomic neutrals the (n,۶,۴) poten tial model shows the best agreement of calculated ion mobilities with experimental values. In all three cases, the phenomenological LJL potential due to Laricchiu ta et al. [۱۳] is less consistent with experimental ion mobility data than are the other two potential m odels studie d in this work

کلیدواژه ها:

ion m obility ، kinetic theory ، ion-neutral interaction ، potential model